Service life up to 4 years High energy density Safety and Environmental Friendly ·Ni-MH rechargeable battery ·Size: AA - cylindrical type ·Nominal voltage: 1 ... .2V per cell ·Size AA: capacity 1000 to 2,200mAh · ... are welcome ·Other sizes of rechargeable batteries are available ·SC,C,D,AAA, A ,2/3SC, 2/3C, 1/2D, F Main ...