Eneloop Panasonic K-KJ55KHC82A pro High Capacity Rechargeable...

High capacity AA and AAA pre-charged Ni-MH rechargeable batteries, up to 2550mAh (AA), 950mAh (AAA)
Recharge up to 500 times
Maintain 85% of their charge up to 1 year (when not in use)
Quickly charge 4AA or 4AAA eneloop pro cells in up to 4 hours; 2AA or 2AAA in up to 2 hours; eneloop 4AA or 4AAA in up to 3 hours; 2AA or 2AAA in up to 1. 5 hours
2550mAh Type, 2450mAh min, Ni-MH high capacity pre-charged rechargeable battery
Recharge up to 500 times
Maintain 85% of their charge up to 1 year (when not in use)
Batteries can be recharged when fully, or partially discharged