The Nikon EN-EL 18d Rechargeable Lithium-Ion Battery has a capacity of 3300mAh, an output of 10.8V, and 36Wh. The battery can charge within the MH-33 charger and it can be used as a spare or replacement battery for the Nikon Z9.

The EN-EL18d batteries cannot be charged using the older MH-26, MH-26a or MH-26ak battery chargers.