eneloop AA batteries can be recharged up to 2100 times [Battery life based on testing method established by IEC Panasonic eneloop batteries are 2000mAh type, 1900mAh min, Ni-MH pre-charged rechargeable AA batteries. eneloop batteries are multi use, come pre-charged with solar energy and are ready to use When stored as per instructions, Panasonic eneloop AA battery can maintain up to 70% of its charge even after 10 years in storage (when not being used). The No Memory effect in Panasonic eneloop AA batteries allows the batteries to be recharged when fully or partially discharged. Panasonic eneloop AA rechargeable battery Works in extreme temperatures ranging from -20 °C to 50 °C temperature range [Operation time will be shorter than that at room temperature. Operating time varies according to equipment]. Rechargeable AA batteries are multi use batteries, they can be used in devices like wireless keyboard, mouse, phone, flashlights, gaming consoles, electronic toothbrush, portable radio, battery powered toys and high-drain devices. Panasonic eneloop batteries provide optimum performance when paired with Panasonic's eneloop chargers.