step-up power bank battery charger board


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this is a very useful and multi-purpose PCB for power managment, battery charging, and power sharing.

it contains the following features:
  • LED indicator to show status of device (in power mode, charging, or automatic shutdown)
  • built-in battery protection circuit
  • over-current, over-voltage, and under-voltage protection
  • dual type A USB port outputs for power sharing
electrical specifications:
  • input charging port: micro-USB type
  • input accepts USB standard of 5V 1A
  • dual output ports, type A
  • output of 5V 1A and 5V 2A
  • can charge 3.7V-4.2V polymer lithium batteries in parallel (do not use batteries with cells in series)
  • batteries of type 18650 flat & polymer are best