eneloop AA and AAA NiMH ready to use rechargeable batteries utilize Panasonic advanced rechargeable battery technology, allowing them to be recharged up to 2,100 times. eneloop AA and AAA rechargeable batteries deliver consistent power performance, maintain 70% of their charge for up to 10 years, come pre-charged by solar power (at the factory) and are ready to use out of the package. These eneloop batteries also feature extreme temperature performance down to -4 deg F. Pair eneloop and eneloop pro AA and AAA batteries with Panasonic advanced, quick advanced, or super quick advance eneloop chargers to maximize your rechargeable battery experience.