With a 3.6 charge voltage, the APS 3 battery pack holds a battery life of up to 4 hours in Axions and 6-8 hours in Thermions. The battery pack is designed to fit the Axion Thermal Monocular and Thermion Thermal Riflescope. Battery Used Type: Li-Ion Quantity: 1 Features Rechargeable lithium-ion battery 3200 mAh capacity Designed to power Axion / Thermion / Digex models Fits Axion Models: Axion XM22 Key, Axion XM30 Key & Axion XM30S 4 hours in Axions 6-8 in Thermions