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. 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. eneloop C and D size battery adapters are designed for use with eneloop AA rechargeable batteries. eneloop C and D size spacers allow for eneloop AA batteries to be inserted and utilized in C and D size battery applications. The battery cells maintain their original eneloop AA rechargeable battery performance characteristics. These adapters are a great alternative when C and D size batteries are not available. Battery life will vary based on the application.