The Pulsar Battery Pack APS 2 will power the Pulsar Thermion Riflescope for up to 5 hours per charge. The charger has an indicator to let you know when it's fully charged. Rated capacity: 2,000 mAh Charging voltage: 3.7 V Battery charge indication via LED Designed to power Thermion / Digex and Digex IR Illuminators MicroUSB charging interface Pulsar Battery Pack APS 2 PL79162