Your #1 USA Lithium Battery Provider!


Shipping / Warranty
NMC / LFP Info
General Battery Info
Additional Questions
Series vs Parallel Connection
Product Usage & Warnings
For Battery Terms & Definitions, Please Click Here.

Product Safety

1. May I apply heat on Lithium batteries or dispose of them in a fire?
2. May I solder lithium batteries directly?
3. Can I use any charger to charge my NMC/LFP Battery?
4. May I force discharge Lithium batteries?
5. May I disassemble or apply excessive pressure on Lithium batteries?
6. Can I use Lithium batteries with other types of batteries?
7. Can Lithium batteries make contact with water?
8. Can the battery be kept inside the appliance if the battery is fully discharged or not in use?
9. May I charge primary Lithium batteries (ex. non-rechargeable AA, AAA, CR2032)?


How long will it take to ship my order?

For US (lower 48 states), generally we ship within 2-3 business days once the order has been placed.


For international, it may take longer due to needing to calculate and charge for special shipping, customs taxes, duties and fees, etc.


Warranty / Returns

What is the return process?
What is the warranty for your batteries?

LFP Batteries

2. Will the LiFePO4 battery be affected by the charging system of a car?
3. Will the car’s charging system overcharge the LiFePO4 battery and shorten its life?
4. What is the starting time for the fuel engine when using a 12V LiFePO4 battery?
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 (’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


NMC Li-ion Batteries

1. What are NMC 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.


Energy and Power

1. Why should I get an Aegis Battery lithium-ion “ENERGY” and “POWER” starter battery?
2. What is the difference between Aegis Battery’s two starter battery models the “ENERGY” and “POWER
3. What advantages does Aegis Battery have over other batteries?
5. How does the CCA ratings compare between lithium-ion and lead-acid batteries?
7. Can I use Lead-Acid battery chargers or tenders?

Battery Information

1. What are the main components of a battery?
3. What is the battery’s inner impedance?
5. Where should Lithium batteries be stored?
7. How can temperature affect a battery’s performance?
8. What are the possible reasons for a battery’s service life to shorten?
11. What will happen if batteries with different capacities are packed together?

Batteries & Vehicles

5. Do I need a BMS/circuitry to protect the battery from under voltage events?
6. What if I did not get the low volt protection and I accidentally drained the battery?
7. What materials do you use in construction of the battery?
10. Is there any warranty for your batteries?
11. What size battery does my vehicle need?
13. Are there batteries for all motorcycles?
14. Do you have a battery for all car makes currently in the market?
15. Will this battery work for all plane models?

Snowmobiles & Watercraft

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.


Choosing your Battery

1. How do I choose the correct battery?

You will need to know your application/device:

  • Voltage: Motor Voltage

            (or the Voltage of the original battery that the application came with).

  • Capacity (Amp Hour) "Ah"
  • Load Power: Watt Hour/Energy Stored

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


Additional Questions

2. If I want to solar charge LFP, which already has PCB, would a normal SLA controller work?