This CTA Digital battery replaces the Canon NP-E3 digital camera battery. This battery was designed to meet or exceed OEM specifications and is 100 percent compatible with the original equipment chargers. Check out Overstock.com for low prices on all your technology needs. Battery specifications: Chemistry: NI-MH Voltage: 12V mAh (Capacity): 2200mAh Memory Effect: No Warranty: 1 Year For use with the following Canon digital cameras: EOS-1D EOS-1Ds EOS-1D Mark II All similar models