This is a simple USB-powered lithium ion polymer battery charger. It has an LED to indicate charge/battery status and is incredibly small and efficient.
|Battery Max Charge Voltage||4.2V - charges a 1S Lithium Ion Polymer Battery|
|Dimensions||22 x 16mm|
|Input Voltage||4.5 to 5.5V|
|LED||Red = Charging, Green = Complete|