Geared towards keeping you on the water longer, the Whitewater Battery Pack is designed to supply power to your Torque(TM) Insulted Heated Vest as well as your phone, camera, and other smart devices. The compact design allows you to easily carry this in your Torque(TM) Insulted Heated Vest or in a fishing bag. Battery consumption for Torque(TM) Insulted Heated Vest per hour: High = 2100 mAh Medium = 1572 mAh Low = 1050 mAh