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 pro 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 deg F. Pair eneloop pro and eneloop AA and AAA batteries with Panasonic advanced, quick advanced, or super quick advanced eneloop pro or eneloop chargers to maximize your rechargeable battery experience. The Panasonic eneloop BQ-CC17, 4-position Ni-MH battery charger delivers advanced, individual cell charging capabilities. Ideal for use at home, in the office, or on the road, this Panasonic CC17 charger is a convenient way to recharge any combination of up to four AA or AAA Ni-MH eneloop, eneloop pro, or conventional Ni-MH rechargeable batteries. The CC17 charger also features 4 LED charge indicator lights and a retractable AC plug. This advanced AC charger is designed to charge battery cells individually; allowing you the freedom to completely charge fully discharged cells or just top off the charge of AA or AAA cells that are only partially drained. The single cell charge capability allows any combination of one, two, three or four AA or AAA rechargeable batteries to be charged at the same time.