Sanyo Eneloop Rechargeable Batteries 4 x AA (pre-charged) Rechargeable Batteries Sanyo Eneloop 4x AA NiMH Rechargeable Batteries are rated at 800mAh and come pre-charged so you can start using them immediately. They are able to hold up to 70% charge, even after 5 years of storage. They are rechargeable up to 2,100 times.