FLIR Systems 3.6 V 2.6 Ah 9.4 Wh Battery Li-ion Black. For use with FLIR's K2 Thermal Camera. Always be ready with a charged spare battery. Specifications for FLIR Systems 3.6 V 2.6 Ah 9.4 Wh Battery Li-ion: Manufacturer: FLIR Systems Color: Black Battery Type: Stand Alone Lithium Package Contents: FLIR Systems 3.6 V 2.6 Ah 9.4 Wh Battery Li-ion FLIR Systems T199423ACC: 3.6 V 2.6 Ah 9.4 Wh Battery Li-ion Black