The 2-Pin "JST" connector is the full power-output and should be connected to your device. The 3-Pin JHS series 2.54mm (0.1") connector is the "Balance" connector, that is used for charging and management of the battery pack. You must use a circuit or charger designed for multi-cell lithium polymer batteries to charge this pack. This battery pack has the following specifications:
- Voltage: 7.4VDC
- Ampacity: 900mA
- Composition: Lithium Polymer
- Size: 2.1" x 1.2" x .75"
- JST Power Connector
- 3 Pin 0.1" JHS Balance Connector
QTY: 1 x 7.4V 900mA Lithium Polymer Battery Pack