Streamlight's rechargeable NiCd battery stick is able to supply high surge currents, making it the perfect choice for the Stinger flashlight. Equipped with 3 cells, this battery stick produces 3.6V of energy. Uses nickel oxide hydroxide and metallic cadmium as electrodes. Rechargeable up to 1000 times. Terminal voltage only changes a little as it discharges. Offers higher energy density, smaller size, lighter weight, and significantly longer total lifetime than other batteries on the market.