The EN-EL15a is a rechargeable Li-ion battery that powers select Nikon DSLR cameras.
These rechargeable batteries provide extended life and consistent power, even in colder conditions.
Power select Nikon DSLRs with this EN-EL15a Rechargeable Lithium-Ion Battery, which serves as a spare or replacement for the one provided with the camera. It is designed to offer long life and consistent power, even when you're shooting in cold conditions, and can be charged or discharged at any time without developing memory effects. The battery is compatible with the MH-25a charger.