Adafruit USB Li-Ion/LiPo Battery Charger

Using this compact lipo charger is a breeze. You can effortlessly connect its gold-plated contacts to any USB port and the JST plug on the other end to a 3.7V/4.2V lithium polymer or lithium ion rechargeable battery. The device features two LEDs, a red one and a green one. The red LED illuminates during the charging process, while the green LED lights up when the battery is fully charged and good to go.

Features

• 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 flipping a switch, no more soldering a jumper closed