The Nikon MH-34 is a battery charger. It is compatible with the EN-EL15c and EN-EL15b Lithium-ion batteries. The MH-34 needs to connect to an EH-8P AC adapter, EH‑7P charging AC adapter, or third-party AC adapters that support USB PowerDelivery. To use the MH-34 with an EH-8P AC adapter, you will need a UC‑E25 USB cable (available separately). The MH-34 battery charger cannot be used to charge EN-EL15a or EN-EL15 Lithium-ion batteries.