Flysky FS-BC101 USB Charger for 800 1000 1300 1700mAh Transmitter Lipo Battery 

The Flysky BC101 charger is very handy for charging a spare FlySky,It will also charge any single cell (3.7v) li-ion battery with the dimensions shown in the specs below.
It is very simple to use, plug the supplied USB cable into your computer, clip in the battery, wait for the light to go green for the charge cycle to be completed. It also comes with an adapter that will allow you to use your charger from an AC socket.

Specification:
Input: 4.5V-6.5V DC
Output: 0.5A
Current: <520mA
LED Indication: Red light on = charging, Green light on = charge completed
Battery Dimensions: L61.3 x W39.3 x D8.75mm

Package Included:
1x FlySky BC101 Charge board(battery not included)
1x USB cable
1x Adapter