Adafruit Micro Lipo USB Battery ChargerĀ 

Description

Part Number: LPC-AD01
*Comes assembled and tested with a free bonus JST cable!
*5V input via PCB-style USB connector
*For charging single Lithium Ion/Lithium Polymer 3.7/4.2v batteries (not for older 3.6/4.1v cells)
*100mA charge current, adjustable to 500mA by soldering a jumper closed
*Free 2-pin JST cable included!

Product Image