Panasonic eneloop pro AA High Capacity Ni-MH Pre-Charged Rechargeable Batteries, 4 Pack, Black

2550mAh type, 2450mAh min, Ni-MH High Capacity pre-charged rechargeable batteryRecharge up to 500 timesMaintain 85% of their charge up to 1 year (when not in use)No memory effect - batteries can be recharged when fully, or partially dischargedWork in extreme temperatures down to -4 DegreeF