The Panasonic eneloop K-KJ75MC64ZA includes 6 AA and 4 AAA eneloop 2100 cycle batteries, a Panasonic advanced battery charger with USB output port, 4 “D’ and 4 “C” battery spacers, and a plastic storage case. eneloop Ni-MH, low self-discharge batteries utilize Panasonic’s advanced rechargeable battery technology allowing them to be recharged up to 2100 times. eneloop battery cells deliver consistent power performance, maintain 70% of their charge for up to 10 years, come pre-charged (at the factory) using solar power and are ready to use out of the package. These eneloop cells also have extreme temperature performance down to -4 degrees Fahrenheit. The Panasonic bq-cc75, Ni-MH advanced battery charger delivers individual cell charging capabilities and a convenient USB charging port capable of charging USB powered devices. Ideal for use at home, in the office, or on the road, This Panasonic CC75 charger is a convenient way to quickly recharge any combination of up to four AA or AAA Ni-MH eneloop, eneloop Pro, or other Ni-MH rechargeable batteries. eneloop "C" And "D" Size spacers for use with eneloop AA battery cells. eneloop "C" And "D" Size spacers allow for eneloop AA batteries to be inserted and utilized in "C" And "D" Size battery applications. These adapters are a great alternative when "C" And "D" Size batteries are not available. Battery life will vary based on the application.