12 volt, 8ah sealed lead acid battery in a waist worn camouflage pack. Includes charger. This accessory can be added to all of our headlights. Used with a 20 watt lamp can last up to 4½ hours. Used with a 50 watt lamp can last up to 1¾ hours. Used with a 100 watt lamp can last up to ½ hour on a full charge.