Battery pack of NiMH 3800mAh, fits inside the BCD pocket, with a dial to select a comfort level between 100% (50 Watts) and 60% (30 Watts). The heating time is 60 minutes at 100% and 110 minutes at 60%. The heater is turn ON and OFF by a magnetic switch. Battery charger not included. The system can also be used to power a light head.
