simple lithium battery charging board


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this is a very simple and DIY friendly charging board for lithium batteries.

  • input: USB standard of 5V 1A
  • cut-off charging voltage of 4.2V
  • max. charging current of 1A
  • battery under-voltage protection of 2.5V
  • battery over-current protection of 3A
  • input micro-USB type and pads for 5V and GND wiring (both ends for DIY use)
  • red LED = charging, green LED = charged
  • best when used with 18650 type lithium cells, 3.6V to 4.2V