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Category : Li-Ion/Polymer Single Cells


There are three types of Li-Ion cells on current market based on chemistry of cathode materials. Please see the table below to see advantage and disadvantage of each type cell.  Among of them, LiCoO2series Li-Ion cell has the highest energy density and is most popular cell using in the market.  LiFePO4 and LiMnNiO4 cell still are in developing  

Chemistry Voltage  Energy Density  Working Temp.  Cycle Life  Safety Environmental Cost based on cycle life x wh of SLA
LiFePO4 3.2V >120 wh/kg  -0-60 °C  >2000 Safe Good 0.15-0.25  lower than SLA
Lead acid 2.0V > 35wh/kg  -20 - 40°C >200 Safe Not good 1
NiCd 1.2V > 40wh/kg  -20 - 50 °C >1000 Safe Bad 0.7
NiMH 1.2V  >80 wh/kg  -20 - 50 °C  >500 Safe Good 1.2-1.4
LiMnxNiyCozO2 3.7V >160 wh/kg  -20 - 40 °C  >500 Unsafe without PCB or PCM, better than LiCo OK 1.5-2.0
LiCoO2 3.7V >200 wh/kg  -20 - 60 °C  > 500 UnSafe without PCB or PCM OK 1.5-2.0

  • Li-Ion battery is dangerous. Must read safety instructions  before buying / using Li-ion / Polymer battery and packs
  • Never use Li-Ion battery pack without PCB (protection circuit board).
  • Please choose our smart chargers to recharge a Li-Ion battery pack

3.6V / 3.7V Li-Ion Cylindrical Cell Series
18650(4/3AF), 18500, 14500(AA),14430(4/5AA) 10440(AAA), 14650 (7/5AA), 17500(A), 20700, 21700, 26650 (Long C ), 26650M, 38120P(M), 40160S(Long M), RCR123A,
3.7V Polymer Li-Ion Single Cells
1-2C rate, High Power, UL listed, & Others size Polymer Li-Ion Batteries
3.6V Li-Ion Rechargeable Button Cells & Charger
2032, 2450 Button Cells with tabs / without tabs & Smart Charger


Q: Your data sheet and warning pages recommend charge the polymer battery between 0 degC and 40 degC. What sort of effects will we expect to see if we charge the battery in ambient conditions near or above 40 degC with little to no air movement? Will this affect performance only or are we at a high risk of swelling or possible venting?

A: The spec is from our supplier. This means under these temperature the cell is guaranteed to work or charge w/o problem. If you charge at higher temperature, it could cause the cell to swollen and damage the cell.

What to consider when designing Lithium Batteries?
Bluetooth Technology for Lithium-ion/LiFePO4 Batteries
UN 38.3 Safety Test

We own a national standard UN38.3 testing lab. We can provide UN38.3 test service to our customer.

If you want to set up your own lab, we also provide UN38.3 & IEC62133 equipments and onsite training. Email us for the quote and lead time.
Lithium Battery Shipping Regulation
Recommendations on How to get ≤30% Rated Capacity for Shipping
Thermal Abuse Test for IEC62133
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