canon g5 This is a 2000 mAh battery with high capacity. The higher the mAh, the more power the battery can store and the longer it will last on one charge. Contains the highest quality Japanese cells and provides better results than Canon original battery. E 'CE certified and built to meet or exceed OEM specifications. E 'ensure safe power to all cameras and camcorders that use the BP-511 BP-511A, BP-512 or batteries. Chemistry is a lithium ion battery allows for 100% free memory. Unlike nickel-cadmium (Ni-Cad) rechargeable lithium ion memory effect that reduces its capacity. This may be partially charged and / or removed without having to worry about reduced battery life. In contrast with most power supplies to replace the batteries have been subjected to rigorous testing of the cell cycle, before leaving the factory. If the battery is not our book ..