The ELB-B001 Battery Pack powers exit and emergency sign lights with ease! It has a capacity of 900mAh and 3.6 Volts to deliver reliable energy. Fully rechargeable, use this battery pack multiple times over. The Nickel Cadmium chemistry provides both high cycle life performance and overcharging. As a result, it doesn't lose performance after multiple charge cycles and is resilient to overuse. Grab this battery in bulk for your business, school, or apartment complex, and power all exit signs and emergency lights.