How to charge 18650 Lithium Batteries


Looking to charge Sparkfun’s 18650 lithium ion cell batteries such as part # 1568-1488-ND or 1568-1490-ND? Although at the moment of this post there is no finished product, here is a solution to help recharge these batteries:

You will need:

This system will be capable of charging one 3.7V 18650 battery at a time.

For more information, check out Sparkfun’s LiPo USB Charger Hookup Guide.


To add to this post- Digi-Key does now have a charger capable of charging 18650 cells, along with other common battery sizes and chemistries. See part number 1568-1748-ND . This charger is capable of charging four cells individually, and can charge AA, AAA, C and Sub-C size NiMH/NiCD batteries, as well as 26650,
22650, 18650, 17670, 18490, 17500, 17335, 16340 (RCR123), 14500 and 10440 Li-ion/LiFePO4
batteries. It automatically identifies Li-ion, NiMH and NiCD rechargeable batteries and can be powered via an included 12v car charger or included standard AC cord.