eneloop pro AA and AAA NiMH ready to use rechargeable batteries utilize Panasonic advanced rechargeable battery technology, allowing them to be recharged up to 500 times. eneloop AA and AAA rechargeable batteries deliver consistent extreme power performance, maintain 85% of their charge for up to 1 year (when not in use), come pre-charged by solar power (at the factory) and are ready to use out of the package. These eneloop pro batteries also feature extreme temperature performance down to -4 degrees Fahrenheit. Pair eneloop and eneloop pro AA and AAA batteries with Panasonic advanced, quick advanced, or super quick advance eneloop or eneloop pro chargers to maximize your rechargeable battery experience. The Panasonic eneloop pro BQ-CC63, 8-position Ni-MH battery charger can quickly, and individually charge any combination of up to eight AA or AAA eneloop pro batteries in just 6 hours or 3.5 hours for eight AAA batteries. Individual charging means you can easily and efficiently charge from 1 to 8 batteries with differing levels of remaining charge. A huge time saver! The CC63 charger also features 8 individual LED charge indicator lights. Once batteries are installed, the charger measures each cell, and the corresponding light rapidly flashes and then becomes a solid green color while charging the battery cell. Once the battery is completely charged, the LED light turns off for that cell. Ideal for use at home or in the in the office, this Panasonic CC63 charger is a quick and convenient way to recharge any combination of up to eight AA or AAA Ni-MH eneloop pro, eneloop or conventional Panasonic Ni-MH rechargeable batteries.