For Battery Terms & Definitions, Please Click Here.


Part 1 - Not Recommended

1. May I apply heat on Lithium batteries or dispose of them in a fire?

The answer is No. This is not recommended.


  • If heated to 100°C or more, the plastic materials in the battery such as the gasket and separator may be damaged, causing leakage.
  • The heat generated by a short circuit inside the batteries may lead to bursting or combustion.
  • If disposed of in a fire, the batteries may burn violently. Batteries should be properly disposed of by bringing them to a recycling center.

2. May I solder lithium batteries directly?

The answer is No. This is not recommended.

  • If solder is applied directly to the battery, resin materials in the Lithium batteries such as the gasket and separator may be damaged due to overheating resulting in leakage.
  • The heat generated by a short circuit inside the battery may lead to bursting or fire.


Even if no abnormality takes place immediately after soldering, the resulting leakage and other damage may harm the components attached to the battery over a long period of usage.


3. May I charge primary Lithium batteries?

The answer is No. This is not recommended.

  • When a Primary Lithium battery is charged, gas is generated inside the battery and can result in swelling, heat generation, leakage, bursting and fire. Primary batteries are not meant to be recharged.
4. May I force discharge Lithium batteries?


 The answer is No. This is not recommended.

  • When batteries are force-discharged with an external power source, the voltage drops to under 0V (reverse electrode), and inner gas is generated. This can lead to swelling, heating, leakage, bursting or fire.


5. May I disassemble or apply excessive pressure on Lithium batteries?

The answer is No. This is not recommended.

  • If a battery is disassembled by force, gas may be generated which can cause throat irritation. The Lithium metal may also generate heat, causing fire.
  • If deformed under pressure or impact, distortion of the seal may lead to leakage, or cause a short circuit inside the battery which can lead to swelling, heat generation, bursting or fire.

6. Can I use Lithium batteries with other types of batteries?

The answer is No. This is not recommended.

  • If different types of batteries are used together, or new batteries are used with old ones, the difference in characteristics such as voltage, capacity, etc. may cause over-discharge of the battery which can lead to swelling, bursting or fire.


7. Can Lithium batteries make contact with water?

The answer is No. This is not recommended.

  • This may cause corrosion or the formation of combustible gas.

However, our ABS sealed version of the battery is waterproof as it is sealed within a plastic case.

8. Can the battery be kept inside the appliance if the battery is fully discharged or not in use?


  • The battery should be taken out from the appliance and kept in a dry place with low temperature if the appliance is not going to be used for a long time.


If not taken out, the system will still make the battery discharge at a low current which will reduce the service life of the battery.

Part 2 - Battery Information

1. What are the main components of a battery?

The main components are:

  • The Positive Plate
  • The Negative Plate
  • Diaphragm Paper
  • Cap
  • Can
  • Insulating Layer
2. What is the cycle life of a rechargeable battery?


The overall lifespan of a battery is expressed in charge cycles.

One cycle is a complete charge followed by a complete discharge.

1 Complete Charge + 1 Complete Discharge = 1 Cycle

Every type of battery has a different cycle life before the capacity falls below 80% of its original capacity.

Our LiFePO4 batteries have 2000+ charge cycles with 80% recoverable capacity.

3. What is the battery’s inner impedance?


  • Battery impedance is the resistance when the current flows through an operating cell, in general the internal resistance is including both DC and AC resistance.

For a rechargeable cell, the resistance is small, the electrode is easily polarized, and it produces a polarization resistance while measuring DC resistance making it difficult to measure the exact value.

4. What is memory effect?

  • Memory effect is only observed in Ni-Cd and Ni-MH rechargeable batteries. It causes the batteries to hold less charge, their maximum energy capacity is lowered.


This situation occurs when the battery is repeatedly recharged after only being partially discharged. The battery appears to remember the smaller capacity. The effect can be repaired by subjecting each individual cell of the battery to one or more deep charge/discharge cycles.

It is important to do it to every individual cell because in a battery some cells may discharge before others causing irreversible damage.


5. Where should Lithium batteries be stored?

  •  Lithium batteries should be stored in a place not exposed to direct sunlight. Make sure the area is dry and has minimal temperature variation.

If stored in areas with high temperatures, humidity or rain, this may cause deterioration in battery quality and durability.

To avoid short circuiting batteries during storage, be sure that the positive and negative terminals do not come in contact with each other.

6. What effects can the battery bring to the environment?

  • Nowadays, nearly all batteries do not contain mercury, but still contain heavy metal.

If there is improper handling, the heavy metal will have negative effects on the environment.

Currently, there are international special institutes that recall nickel cadmium batteries and lead acid batteries.

Our company is striving to replace nickel cadmium batteries with nickel metal hydride batteries and lithium-ion batteries.


8. How can temperature affect a battery’s performance?

  • Among all the environmental elements, temperature has the greatest effect on battery performance.
  • The electrochemical reaction on the electrode/electrolyte interface is correlated with the temperature. The electrode/electrolyte interface is considered to be the heart of the battery.
  • If the temperature decreases, the reaction rate of the electrode also decreases.
  • If the battery voltage keeps being invariable, the discharge current becomes lower, and the power output will reduce.
  • If the temperature goes up, the condition reverses.


*That is, the battery’s power output will increase.

Temperature will also affect the speed of the transmission of the electrolyte.

  • If the temperature increases, the speed of transmission will be faster.
  • If the temperature decreases, the speed of transmission will be slower.


However, if the temperature becomes too high, the chemical balance inside the battery will be broken and side reactions will occur. Overall, the battery performance is greatly affected by the temperature.


9. What are the possible reasons for a battery’s service life to shorten?


Possible reasons include:

(1) charger or charging circuit does not match with the battery;

(2) over charge and over discharge of the battery;

(3) battery does not match with the appliance.


10. What are the possible reasons for a battery to have zero or low voltage?


Possible reasons for a battery to have zero or low voltage include:

(1) a single battery cell in the battery pack has zero voltage;

(2) short circuit or open circuit of the connector or wrong connection;

(3) missing solder or cold solder joint between the battery and connection strap;

(4) wrong connection between the batteries;

(5) the wrong connection or failure of the electronic components inside the battery pack;

(6) the battery is continuously overcharged with a high current.


11. What are the possible reasons if the battery pack cannot be charged or recharged?

Possible reasons for a battery pack that cannot be charged or recharged include:

(1) the battery has zero voltage or there is an individual cell with zero voltage in the battery pack;

(2) there is a wrong connection inside the battery pack;

(3) there is an abnormity of electronic components and/or PCB inside the battery pack;

(4) failure in the charge;

(5) outer elements cause the charging efficiency to be too low, such as extremely low or high temperature.


12. What will happen if batteries with different capacities are packed together?

  • If batteries with different capacities or new and old batteries are used together it can cause leakage and zero voltage.
  • If the batteries are rechargeable and are being charged, some batteries will be overcharged and other batteries will not be fully charged.

During the discharge, some batteries cannot discharge fully and other batteries might over discharge. Overall, the battery will be damaged if batteries with different capacities are packed together.


13. Do I need an external charger?


The answer is No.

The alternator will charge it just like lead acid battery at 14.4V. No trickle charging is required. Lithium batteries do not lose charge sitting unused like lead acid batteries.

Part 3 – LFP Batteries

1. What are Lithium Iron Phosphate batteries (LiFePO4)?


Lithium Iron Phosphate (LiFePO4) batteries provides several advantages over traditional Lithium-ion batteries based on LiCoO2. LiFePO4 batteries provide much higher specific capacity, superior thermal and chemical stability, enhanced safety, improved cost performance, enhanced charge and discharge rates, compact size, light weight, and enhanced cycle life. LiFePO4 batteries can offer a cycle life of over 2,000 charge cycles!

2. Will the LiFePO4 battery be affected by the charging system of a car?

  • The 12V LiFePO4 battery will not be affected by the car’s charging system at all.


A majority of the cars’ charging systems charge up to 14V or 14.4V.

This represents the charging level of 70% to 75% for LiFePO4 batteries.

3. Will the car’s charging system overcharge the LiFePO4 battery and shorten its life?

The answer is No.

  • The overcharge for 12V LiFePO4 batteries is above 17V.


There is no way to reach this voltage in the vehicle. As the LiFePO4 battery has no memory effect, it can be charged any time to any capacity without shortening its life.


4. What is the starting time for the fuel engine when using a 12V LiFePO4 battery?

  • The starting time for any fuel engine is given by the vehicle manufacturer.

Usually, it is about 5 to 10 seconds. This time is the same for LFP batteries.

In any case, the fuel engine should not be started with long starting attempts. Please see the vehicle instruction for starting the engine.

5. What is the max current available from the 12V LFP battery?    

  • The 12V LiFePO4 battery can release the energy very quickly without any limitation.
  • The peak short connection current may reach above 1000A.

Unlike lead-acid batteries that are limited by the Peukert’s law (http://en.wikipedia.org/wiki/Peukert’s_law), LiFePO4 batteries do not have any such limitations.

However, due to the high energy release, LiFePO4 batteries should not be extremely discharged for longer than 10 seconds.

The discharge values table for a 12V, 40Ah battery is shown below:


20A current (namely 0.5C discharge)

120-minute (2hrs) use

40A current (1.0C discharge),

60-minute (1hr) use

60A current (1.5C discharge)

40-minute use

200A current (5C discharge)

max 10 s. peaks

400A current (10C discharge)

max 10 s. peaks

1000A current (25C discharger)

max 5 s. peaks


Part 4 – NMC Lithium Ion Batteries


1. What are Lithium-Ion batteries (Li-ion)?

  • Lithium-ion batteries are rechargeable batteries in which lithium ions move from the anode to the cathode during discharge and back when charging.
  • They are popular batteries for use in consumer electronics because they provide good energy density, no memory effect, and a slow loss of charge when not in use.
  • These batteries come in a wide variety of shapes and sizes.


 In addition, compared to lead-acid batteries, Lithium-ion batteries are lighter and provide a higher open circuit voltage, which allows for power transfer at lower currents and excellent for engine starting applications.

These batteries have the following characteristics:

  • Very light weight, up to 80% less than a conventional, comparable lead acid battery.
  • Lasts 300-400% longer than lead acid.
  • Faster engine turn-over for better starts.
  • Lower shelf discharge rate (2% vs. 5-8% /month).
  • Drop-in replacement for your OEM battery.
  • Expect 10-12 years of battery life that will reduce your operating cost by half that of lead acid.
  • No explosive gasses during charging, no acid spills.
  • Environmentally friendly, no lead or heavy metals.
  • Safe to operate!


The term "Lithium-ion" battery is a general term. There are many different chemistries for Lithium-Ion batteries including LiCoO2 (cylindrical cell), LiPo, and LiFePO4 (cylindrical/prismatic cell). Aegis Battery mostly focuses on design, manufacturing, and marketing LiFePO4 batteries for its starter and energy storage batteries. Lithium nickel manganese cobalt oxide (NMC) is used for some custom applications.

Part 5 – “ENERGY” and “POWER”


1. Why should I get an Aegis Battery lithium-ion “ENERGY” and “POWER” starter battery?

Lithium-ion batteries provide multiple advantages over standard lead-acid batteries for engine starting use that we'll outline below:


  • Substantially lighter – Lithium-ion batteries are just a fraction of the weight of the original lead-acid battery.
  • More powerful – Lithium-ion batteries operate at a higher voltage than standard lead-acid battery, giving you faster engine turn over for better starts. Lead-acid batteries drop to just 12.5V when only 20% of the battery capacity is used, but lithium-ion batteries provide over 12.8V even when only 20% of the battery capacity is left.
  • Low self-discharge rate – Lead-acid batteries lose 4%-25% of their charge every month depending on the quality of the plates and separators used. If you leave a vehicle unattended for a month, the lead-acid battery might lose so much power that the vehicle might not start. On the other hand, our lithium battery chemistry loses less than 3% of charge per month. You can go for several months without having to worry.
  • Environmentally Friendly – Aegis Battery batteries contain no toxic substances. There is no toxic, poisonous lead, no corrosive sulfuric dangerous acid and as a result, no possible way for an explosive gassing event that occurs with lead-acid batteries. In addition, there is no need to maintain acid levels and worry about venting as traditional Lead-Acid batteries do. Aegis Battery batteries can be installed in any orientation and the only maintenance involved is just to ensure the battery never gets beyond 80% drained to ensure optimal life.
  • Long lasting – Cheap lead-acid batteries usually only last 1 to 2 years while gel and AGM lead-acid batteries last 3-5 years with proper maintenance. However, Aegis Battery’s lithium batteries can provide 10-12 years of use, easily exceeding the life of any lead-acid battery. Battery life depends purely on proper operation and maintenance, so use common-sense and ensure the battery does not drain beyond 80% discharge. If you are replacing a lead acid battery in two years or less due to deep cycling damage, you will save money in the long run moving to an Aegis Battery lithium-ion battery.
  • Fast recharging – Aegis Battery lithium batteries can accept charge current at up to 5x faster than a lead acid battery. What’s more, the charge efficiency is about 75% for lead acid in contrast to 97% for Aegis Battery’s lithium battery. That means less energy needed to charge and less strain on your alternator.


2. What is the difference between Aegis Battery’s two starter battery models the “ENERGY” and “POWER” batteries?


1) “ENERGY” – Aegis Battery’s “ENERGY” has an internal cell balancing circuit that is processor controlled inside each of its “ENERGY” batteries to maximize the performance and life of the battery pack. No expensive charger maintainer is needed to do cell balancing service. Lithium-ion cells over time will drift having different capacity, some having higher voltages. Without our cell balancer, individual lithium-ion cells within the battery would have voltage drift over time. This imbalance would reduce performance and battery life.

2) “POWER”- Aegis Battery’s “POWER” has the same features (cell balancing) as the “ENERGY” but with additional features. Aegis Battery’s “POWER” has a processor-controlled Battery Management System (BMS) inside each case to monitor each cell to prevent over charging, over discharging (voltage draining too low) along with cell temperature monitoring. Should any of the cells reach outside of its allowable specifications, the terminal power will turn off. These are added performance and convenience features to prevent a battery from being damaged or in the event a battery is left unattended for a long time. These added features also prevent the battery from overcharging when attached to other charging equipment or charging failure.

In the “POWER” models, the processor-controlled Battery Management System (BMS) has the ability to provide reserve engine start-up power when needed. At motorcycle rallies or gatherings, owners of heavily accessorized motorcycle often want to keep their radios or lights on when parked, possibly draining standard lead-acid batteries too much. The “POWER” automatically senses excess drainage status, shutting all accessories off, while maintaining sufficient reserve power to start the engine. This is known as Aegis Battery’s “IQ RESTART TECHNOLOGY”- Adequate reserve power is left in the battery, to automatically detect starting effort with a key cycle and allows users to start the engine again and not leaving you stranded or with the headache of calling for service or even needing to replace the battery. A significant advantage of the ‘POWER” technology and a major selling point is the “IQ Restart Technology”.

3. What advantages does Aegis Battery have over other batteries?

Aegis Battery utilizes the latest advancements in Lithium-ion battery technology along with custom features to provide you with the best battery for your vehicle:


    • Internal cell balancing circuit – Aegis Battery has a processor controlled, internal cell balancing board inside each of its “ENERGY” and “POWER” starter batteries to maximize the performance and life of the battery pack
    • Battery Management System (BMS) – Aegis Battery’s “POWER” has the same features (cell balancing) as the “ENERGY” but with additional features. Aegis Battery’s “POWER” has a processor-controlled Battery Management System (BMS) inside each case to monitor each cell to prevent over charging, over discharging (voltage draining too low) along with cell temperature monitoring. Should any of the cells reach outside of its allowable specifications, the terminal power will turn off. These are added performance and convenience features to prevent a battery from being damaged or in the event a battery is left unattended for a long time. These added features also prevent the battery from overcharging when attached to other charging equipment or charging failure.
    • IQ Restart Technology – At motorcycle rallies or gatherings, owners of heavily accessorized motorcycle often want to keep their radios or lights on when parked, possibly draining standard lead-acid batteries too much. The “POWER” automatically senses excess drainage status, shutting all accessories off, while maintaining sufficient reserve power to start the engine. Aegis Battery’s “IQ RESTART TECHNOLOGY”-automatically detect starting effort with a key cycle and allows users to start the engine again and not leaving you stranded or with the headache of calling for service or even needing to replace the battery. A significant advantage of the ‘POWER” technology and a major selling point is the “IQ Restart Technology”.
    • FREE CHARGER/Maintainer included – Aegis Battery provides a FREE charger with every new “ENERGY” and “POWER” starter battery that can be used as a battery maintainer/tender when vehicles are not used many months at time.
    • Unique Aluminum quad-terminal design – Another design unique to the Aegis Battery’s is an aluminum quad-terminal design which allows for one battery to adapt to two different mounting positions as well as maximizing weight savings using aluminum material. This helps carry reduced manufacturing and dealer costs. Whereas in the past, you had to get a specific battery for your application based on polarity and loosing nuts that slide out. Aegis Battery’s design allows for easy installation.
    • Best Engineering – Aegis Battery are the result of years of our own research and development with years of testing. Aegis Battery lithium-ion battery packs have been designed from the “ground up’ to be a powersports starter battery with long lifespan and high performance, under a wide range of temperatures. While other cells may crank a vehicle successfully, they were not originally intended for the high current discharges in starter systems. As a result, cranking performance suffers compared to Aegis Battery and the batteries will wear out. Combined with our strict quality control and mass production technologies allow us to make the best batteries at the most attractive price points.
    • Prismatic cells – Cylindrical cells only come in certain sizes, which limit the possible shapes and sizes of the starter battery case designs. As such, battery fit into many vehicles may be poor, or impossible as they are too wide, or too tall and create internal hot spots. Aegis Battery prismatic cells, on the other hand, are rectangular packages which we can freely design and size according to the size requirements of the battery case. As such, Aegis Battery offers perfect drop-in fit in most vehicles along with having better thermal management properties.


    4. How does the Aegis Battery’s lead acid equivalent “Pb Eqv" capacity (Ah) rating compare to lead acid’s capacity rating?


    Lead-acid batteries used for starting purposes are designed only to provide the maximum current to start your vehicle. Typically lead acid starter batteries can only be discharged about 20%~25% before the plates begin the process of disintegration (sulfating). Any further than that will quickly reduce the total life of the battery. Therefore, a lead-acid battery rated for 15Ah has only about 3~3.75Ah of usable capacity. Aegis Battery lithium-ion batteries have 1/3 the internal resistance of a similar capacity lead acid battery and they can be safely discharged to 90% DOD. Lead acid internal resistance rises as they are discharged; the actual capacity which can be used may be as little as 20% of the mfg. rating. Discharge in excess will not only damage the lead-acid battery, it may not allow proper starting as voltage sags. Aegis Battery’s lithium batteries hold a higher voltage during discharge. An Aegis Battery lithium-ion battery in a starting application can replace lead acid batteries of 3x the size in capacity. Therefore the capacity (Pb Eqv) is a way of comparing the starting capacity lithium battery can do vs. a lead acid battery. If you have a 12Ah lead acid battery in the vehicle today, you can safely replace it with a 12Ah (Pb Eq) battery from Aegis Battery for engine starting applications.


    5. How does the CCA ratings compare between lithium-ion and lead-acid batteries?

    CCA, or Cold Cranking Amperes, is defined as the amount of current a lead-acid battery can provide at 0°F (-18°C) for 30 seconds and maintain at least 1.2V per cell, which for a 6 cell 12V lead acid battery equates to 7.2V. The idea behind this definition is, in colder environments, batteries cannot push out as much current, starter motors have to overcome greater resistance from the lubricants having higher viscosity and fuel ignition is harder to achieve. Problem is, 7.2V isn't enough to start an engine in a vehicle with a 12V power system and as such, the CCA is no more than an arbitrary figure, and one that is most misused and misrepresented. What really starts a vehicle is current multiplied by available voltage which is power (Watts)! Once again, because Aegis Battery batteries have so much less internal resistance it is able to deliver more voltage for a given amp draw, and thus more usable starting power. Both lead-acid and lithium-ion cells have increased internal resistance as the temperatures fall. Lithium batteries have more internal resistance in extreme cold, temperatures of 0°F (-18°C) or lower, however, the batteries can be warmed up much quicker simply by putting a load on the battery, such as turning on your headlights for 15 to 30 seconds. Since Aegis Battery batteries have substantially lower mass than lead-acid batteries, they warm up much quicker and can deliver their normal crank ratings


    6. Do lithium-ion batteries crank poorly when it gets cold?

    Lithium-ion batteries do increase in resistance more as temperature drops, compared to lead-acid thus reduce performance at first start. However, they also react to cranking under cold conditions in a much better way. Lead-acid will increase resistance on each subsequent cranking attempt, until it won’t turn over. If your “ENERGY” or “POWER” fails to start the engine on first crank, that first crank has warmed the battery, and the second attempt will be much stronger, and so on until you get a good start. If your headlight comes on at key-ON, it is good for the batteries to flow some current before cranking in cold weather. We suggest leaving the headlights on ~ 30 seconds before cranking 40F (5C), 30 seconds. That will help wake the battery and increase cranking performance. At 0F (-17C), leave the lights on for 2~3 minutes before cranking. The result will be a better first crank, and longer battery life. Any other accessories that can be turned on before cranking can also be used for this purpose, such as heated gear, radio, etc. With Aegis Battery’s tender plugged in it will increase the internal cell temperature to help with cold starts.


    7. Can I use Lead-Acid battery chargers or tenders?

    Aegis Battery is providing a FREE charger/tender with every new starter battery purchased with cables. A fully charged lithium-ion battery can sit for a year or more and still retain adequate starting capacity, without damaging the battery. As such, any vehicle that has no current flowing when the key is OFF should never need a tender. However, newer vehicles may have a significant draw even when the key is OFF, to maintain clocks, computers, navigation, pumps etc.

    Thus, Aegis Battery is providing a FREE charger/tender with every new “ENERGY” and “POWER” battery purchased. We want to provide maximum battery life and performance for all your vehicles that might not be used very often or have a vehicle drain. If you know that you will go a number of weeks or months without riding, you can either attach our Aegis Battery charger/tender, or disconnect the negative cable from the battery. Aegis Battery’s lithium-ion battery chargers have been designed to work together with the internal cell balancing board in “ENERGY” and the BMS in “POWER” batteries that have special algorithms to prevent over-charge and maximize life of the battery. We have a very simple approach, all the cell balancing maintenance is done automatically either while running your bike or when the charger is attached. Aegis Battery does NOT recommend using lead acid chargers for LiFePO4 batteries. Lead acid batteries charge at 2.30V to 2.45V per cell whereas LiFePO4 batteries require 3.60V per cell. Your battery would potentially be undercharged, so you will not get to use the full capacity of the LiFePO4 battery, nor will balancing be triggered in the LiFePO4 battery pack, both of which are not desired. Furthermore, the floating charge of the lead acid charger is not expected by the battery and can cause problems. Lead Acid trickle chargers should not be used. Use Aegis Battery’s charger that is provided.


    8. What happens if I charge my “POWER” battery to high?

    If you charge your “POWER” battery above 15V for 12V battery, the BMS inside the battery terminal will turn off. The cut-off voltages settings will vary slightly depending on current levels, temperature and part tolerances. To turn ON the battery again, disconnect the charging source and let the battery rest for several seconds (~30sec). It should come on, in the event the 12V battery had voltages higher than 18V the internal BMS is damaged and will not turn ON.


    9. Can Aegis Battery “ENERGY” and “POWER” be mounted in any position?

    Yes. There are no liquids in the “ENERGY” or “POWER” batteries. Because the chemistry is a solid, the battery can be mounted in any direction and there are no worries about lead plates cracking from vibration. All batteries on our product list can be mounted in any orientation.


    10. I heard Lithium-ion batteries are unsafe and are a fire hazard. Will they blow up or catch on fire?

    Every battery of ANY chemistry has the potential to fail, sometimes catastrophically and catch on fire. In addition, lithium metal batteries which are more volatile and not rechargeable should not be confused with lithium-ion batteries. However, our lithium-ion chemistry, lithium iron phosphate (LiFePO4), is the safest on the market having the highest thermal runaway threshold temperature from all the different types of lithium batteries. Remember, there are many lithium-ion chemistries and variations. Some are more volatile than others but all have made advances in recent years. Also note that all lithium-ion batteries undergo rigorous UN testing before they can be shipped worldwide further ensuring their safety.


    11. How long will my “ENERGY” or “POWER” battery last?

    There are several factors that affect battery life. Weather, temperature, recharge cycles, depth of discharge (DOD), discharge current, charging current, charging method, vibration and duration of static use can all have dramatic effects on battery life. A properly maintained “ENERGY” or “POWER” battery should last roughly three times as long as lead-acid used in similar conditions.


    12. Can I use the battery in an application other than in a powersports vehicle?

    Yes. These batteries are designed and developed to be used for powersports applications, but they may be useful for many other applications. However, our warranty only extends to appropriate powersports applications. If you have a question about applications other than powersports use, please call us and our customer service professionals will be happy to help.


    12. Will Aegis Battery be making batteries for cars?

    We have no solid introduction date in mind for automotive versions at this time, but we do plan on having more battery models available in the near future to be used in cars as well. The higher PB Eqv Ah batteries will start vehicles but will have limited reserve energy.


    14. What happens if I discharge my “ENERGY” and “POWER” Battery too low?

    One of the primary benefits of Lithium Iron Phosphate (LiFePO4) batteries is that they discharge at an incredibly slow rate (10% per year of static use) so it is very hard to discharge the battery in a conventional application with an on board charging system. If for some reason you discharge your “ENERGY” battery, the best thing to do is to recharge it as soon as possible. You should not allow the battery to discharge below 9.0V, as this can damage the cells. If the battery is drained below 6.0V then the battery is considered to be discharged beyond its capacity and it should be discarded according to local land fill regulations. Do not discharge below 9V to avoid damage. The “POWER” will prevent the battery from discharging too low and turn off the terminal power. Simply turn the key for an “IQ RESTART” or connect an Aegis Battery charger for the “POWER” to be able to use the battery again.


    15. Can I buy another of the same LiFePO4 batteries to double the voltage or capacity?

    Aegis Battery recommends that you purchase a single battery that meets your voltage and capacity requirement to avoid any problems. However, the “ENERGY” batteries can be put in series for higher voltages but the “POWER” can NOT be put in series for higher voltages. Both the “ENERGY” and “POWER” can be put in parallel to increase capacity and starting amps.


    16. Do “ENERGY” or “POWER” batteries generate more heat than a lead-acid battery?

    No. One of the advantages to the Lithium Iron Phosphate (LiFePO4) chemistry is that it generates its own internal heat energy. The outside temperature of the battery pack itself will get no warmer than a lead-acid equivalent in normal use.


    17. Will the cost of Lithium-ion batteries become cheaper?

    At the moment, Lithium-ion materials are about 3~4 times higher than lead acid for the same capacity. This will no doubt come down as worldwide supply goes up.


    18. Can you jump start a dead Lithium-ion battery?

    No. Lithium-ion batteries are especially susceptible to cell damage when they are empty. Aegis Battery chargers will reduce the output current when it detects a lithium-ion battery at a very low SOC. This being the case, jump starting would send uncontrolled amperage into a very low lithium-ion battery causing damage to the cell. Please do not do that.


    19. Is an “ENERGY” and “POWER” battery a direct OEM replacement for my stock battery?

    YES. The “ENERGY” and “POWER” will perform as a direct replacement for your lead acid battery. Our battery cases match most OEM battery case sizes and padding has been provided in the event you need to raise the battery slightly. All equivalency charts and applications guides are based strictly on battery performance with our quad terminals.


    20. Which is the correct “ENERGY” and “POWER” battery for my powersports vehicle?


    We have a complete application chart HERE, in which you can select the correct application for your powersports vehicle based on year, make, and model, or as a lead-acid equivalent. If your application is unique please feel free to contact us at Aegis Battery and our customer service professionals will be happy to guide you.


    21. Can Aegis Battery be fully discharged and then disposed of regular in the garbage?


    Lithium-ion batteries are subject to disposal and recycling regulations that vary by country and region. Always check and follow your applicable regulations before disposing of any battery. Please contact Rechargeable Battery Recycling Corporation (www.rbrc.org) for U.S.A. and Canada, or your local battery recycling organization to properly dispose of your batteries. Many countries prohibit the disposal of waste electronic equipment in standard waste receptacles. Place only discharged batteries in a battery collection container. Use electrical tape or other approved covering over the battery connection points to prevent short circuits.


    PART 6 – Batteries & Vehicles  

    1. Can I bring the battery inside in freezing temperatures?  

    The answer is Yes.

    Even though Lithium batteries have a working temperature range from -20°C to 60°C you can bring it inside.

    You can order the optional Quick Disconnect feature to simply unsnap the battery during freezing conditions and bring it inside to stay warm. If you forget to bring it inside, turn on headlights for 30 seconds to warm up the battery before starting your vehicle.


    2. Is the battery shockproof? 

    The answer is Yes.

    Although we do not recommend dropping the battery it can withstand a drop from a few feet up and still be fine because they are built with a bottom cushion.


    3. Are there different form factors for all applications?

    The answer is yes.

     We have a different form factor for our battery products including flat, wide, tall, thin, etc.

    If there is a custom form factor feel free to contact us and we might be able to make a custom battery for your application.


    4. How do I estimate a pricing for a starter battery?

    Different starters pull a range of current to start the engine on hot and cold days. This will determine the Ah size pack you need which will determine the price.

    If you have a clamp-on ammeter, simply put it around a battery cable and turn the engine over; you will read the actual amps required. Do this 3 times to get the highest reading.


    5. Do I need a BMS/circuitry to protect the battery from under voltage events?

    The answer is Yes.

    • Only IF you have a bad habit of leaving the headlights on or have a constant power drain from an alarm or some other drain after the ignition is turned off.
    • Optional BMS is $100 extra for M cycles
    • $200 extra for cars.


    6. What if I did not get the low volt protection and I accidentally drained the battery?

    It depends on how low the voltage got and how long it stayed there for. The battery might be recoverable with a Lithium charger.


    7. What materials do you use in construction of the battery?

    • Copper is used for cell connections and terminal post leads. Brass is used for the terminal posts

    8. What if my cables are not long enough to reach a small battery?

    If your cables are not long enough you need "rabbit ears" battery lead extensions. They can be purchased from us at +$25.


    9. Should I replace my batteries in my jet skis, ATVs, motorcycles, airplanes, etc.?

    All powersports vehicles and planes can benefit from a Lithium replacement. Contact us at Aegis Battery to further discuss your options.


    10. Is there any warranty for your batteries?


    Please click here to review Aegis Battery Warranty/Return Policy.

    (Drained dead batteries are not covered).


    11. What size battery does my vehicle need?

    The size of the battery depends on the current needed by the starter when cranking the engine.

    • 4 cylinders - 7Ah
    • 6 cylinders - 9Ah
    • 8 cylinders - 11.5Ah

    Examples are provided on the sizing page.


    12. How can such a small battery run my lights, stereo, etc.?

    The battery does not run the lights, stereo, etc.; the alternator provides the power for those devices.


    13. Are there batteries for all motorcycles?

    Yes, our batteries will work for all motorcycles.


    14. Do you have a battery for all car makes currently in the market?  

    Yes, our batteries will work for all cars currently in the market.


    15. Will this battery work for all plane models?  

    Yes, the battery will work equally well for all plane models.


    16. How do your batteries compare to Shorai batteries made in China?

    Shorai batteries have a lower discharge rate than our batteries. You also can’t contact them directly when you have any issues with your batteries. The final thing is that the battery terminals are made of steel which is flimsy because it is inexpensive compared to copper and brass. Although the batteries from Shorai are cheaper it is not as safe and reliable as our batteries.


    Part 7 – Snowmobiles & Watercraft

    1. How well do Aegis Battery batteries work in Snowmobiles and Watercraft?


    Our batteries work great in these applications due to the extreme weight loss but are recommended strictly for Performance or Race use due to some of the issues with cold weather for Snowmobiles, and with Watercraft, the fact of the direct drive starting system that needs more cranking power to turn over.


    For use in Snowmobiles; All Lithium Batteries have what is called “Cold Lag”.

     When lithium is extremely cold it will suffer from initially sluggish performance until it is warmed up. The battery self-warms with short start attempts by discharging amperage which causes it to self-warm and soon get its full power back, but it must be pointed out that Snowmobiles are often ridden in these extreme temperatures and must consider this Cold Lag issue.

    We recommend a minimum of 1 to 2 sizes larger for use in Watercraft of Snowmobiles, but please contact us for more information in determining what will work best for you.

    2. Are there any concerns regarding these batteries?


    If you are using the smallest battery possible for your bike to save weight (for example, for racing use a 4-cell in a 600cc bike, or an 8-cell in a 1000cc bike) you may find in 50-degree weather and below it may be sluggish initially. But with each attempt to start the battery actually warms itself from the amp discharge and gets back its full strength. If you often ride in weather below the 50s, we recommend going up one or two sizes on the battery, this will give you more cranking amps to get power even if it’s very cold.

    You can ruin the battery if you let it drain to below 10.5 volts!

     This is true of ANY battery, lead/acid or lithium. Draining a battery to this level will damage the battery cells. This is not a concern if you remember to turn off your ignition, or turn off any accessories that are not ignition switched and monitor your battery is you plan on not riding frequently. You should also make sure your vehicle does not have a “parasitic drain” or “short circuit”. A “parasitic drain” is something like an accessory that is pulling energy from the battery even though the ignition is “off” this can drain your battery below 10.5V and ruin it if you store the bike or don’t ride it to keep it charged. Sometimes a short can also be the cause of a drain on the battery though all accessories are “off”. For the best battery life you should monitor your battery and if you do not ride for a time make sure you disconnect the battery or put it on a lithium maintenance charger.

    Also important is that OVER-CHARGING above 14.8V can damage Lead or Lithium batteries. For this reason, older bikes should make sure their electrical system and specifically the Voltage Regulator is operating correctly or you will find yourself damaging your batteries if your bikes charging systems voltage to the battery is going above 15V.

    DO NOT ABUSE the battery. These batteries express extremely high amperage and can get over-heated if you keep cranking a bike repeatedly over 7 seconds multiple times in a row. Though they are made to start your bike with fantastic results they can become over heated if you keep trying to crank a bike that just isn’t starting.


    PART 8 – Choosing your Battery


    1. How do I choose the correct battery?

    You will need to know the Device:

    • Voltage
    • Capacity (Amp Hour)
    • Watt Hour/Energy Stored

    *Feel free to contact us at Aegis Battery to choose the best battery for your application.

    2. How do I charge the battery?

    The Aegis Battery batteries come ready to install, and start the bike/vehicle. We do offer a specific “smart” Lithium battery charger that is specifically for charging LiFePO4 batteries. We have a 4-amp and an 8-amp charger as well as 2 Optimate Chargers. All will charge the battery to its intended peak voltage and will shut off when the battery is charged.

    You should NOT use an automobile or motorcycle charger that is specific to lead acid batteries! They can cause damage to the batteries because they charge in a different way than a specific LiFePO4 charger. They often have a desulfinate feature or over voltage “Quick Charging” feature, both of which will damage LiFePO4 batteries. Lead acid chargers in many cases will overcharge a lithium battery, ending up in damage which is not covered under our warranty.

    3. What is the range of voltage for the batteries?

    The Aegis Battery batteries have a normal voltage of 13.2V. The battery will read up to 14.7V immediately after charging. The normal operating range will read between 13.3-14.5V. After a few hours it will self-balance to the 13.3-7 range which is its normal state of charge. The maximum voltage the battery should be exposed to is 14.7V. On the lower end of the voltage range the battery should be put on a charger if the battery voltage drops below the 12.5V range while sitting. The voltage should not be allowed to drop below 10.5V while at rest. Permanent damage will occur below 10 volts.


    Part 5 - Additional Questions

    1. I am trying to charge my battery with solar panels. If the battery pack already has the PCB/PCM protection, do I still need a solar charger controller? 


    Yes, even though the battery pack has built in PCB/PCM protection you do need the solar charger controller in order to regulate the voltage from the solar panels for your battery pack.

    2. If I want to solar charge a LiFePO4/Lithium-ion battery, which already has PCB, would a normal SLA controller work fine?


    For LiFePO4/Lithium-ion battery, we always recommend using LiFePO4/Lithium-ion solar controller especially if you are using the battery as an UPS (backup power supply). The Lead acid solar controller will constantly provide pulse current to the battery, in the long run, it might damage the PCB. As a result, the PCB won't be able to protect the battery when it should be. The LiFePO4/Lithium-ion solar controller won't provide constant current when the battery is fully charged which makes it much safer and more reliable.





    Temp. (°C)

    Cycle Life

    Shelf Life


    Volts per cell

    Lead Acid


    Very Heavy

    -65 to 80




    Nickel Cadmium



    -20 to 65




    Nickel Metal Hydride



    -10 to 65




    Lithium Ion



    -20 to 60




    Lithium Polymer



    -20 to 60






    • Li-Ion batteries have the highest energy density (mAh/weight), and are becoming more and more popular. However, Li-Ion batteries may explode and cause a fire if not used properly. Please read our safety warning.
    • In current stage, we always suggest customer to use NiMH battery pack for high current application ( < 1C rate ), not Li-Ion, because Li-ion’s protection in high current application still is not matured yet
    • Choose a Battery Charger
    • Please always follow our suggestion to choose a smart charger. So called smart charger must have automatic power cut-off function when the battery is full.
    • Never use NiMH battery charger for Li-ion battery pack, it will cause battery to explode
    • Always pay attention while charging a battery, and put the battery in a fire-proof container box to avoid any accidents
    • Understand the risks to using NiMH and Li-ion batteries. Please read our safety warning before buying a battery