The ACD-800 Battery for the Nikon EN-EL18d from Power2000 is 100% compatible with the Nikon Z9 mirrorless camera. It is also backwards compatible with EN-EL18 B/C which work in the D4, D4S, D5, D800/E, D810/A, and D500. The ACD-800 can be charged in the OEM Nikon charger. It features ultrahigh power cell technology with an extended runtime higher than the OEM. This battery features an integrated chip that is fully decoded, plus a built-in safety fuse to prevent overcharging, overheating, or equipment damage.