Venom Racing pre-assembled 7 cell, 800mAh Nickel Metal Hydride Battery Pack. NiMH batteries have a different chemistry than NiCd batteries so they require different charging methods. Pre-assembled NiMH for use with R/C Helicopters. Higher average voltage means more power verses NiCd packs. NiMH cells have no discharge memory so there is no need to deep discharge them by shorting out the cells. This damages the cells. No need to be recycled, NiMH cells are environmentally friendly.