A genuine spare 3.7V/5200mAh rechargeable lithium-ion battery pack made specifically for the REED R2170 thermal imaging camera, useful for extending fieldwork time or replacing a pack that no longer holds a charge. It recharges over USB Type-C in about 4 hours, includes a push-button LED indicator so users can check remaining charge without powering on the camera, and has built-in overcharge protection with a quick-release tab for easy swapping.