Nikon Z8 USB‑C Power Supply: The Difference Between USB Power Delivery and Battery Charging

First, distinguish between “power supply” and “charging”

After the camera is connected to USB-C, the external power may be used to operate the camera or to charge the battery; the actual use depends on the camera settings, operating status, connected port, power source, and battery. The Nikon Z8 manual clearly distinguishes USB Power Delivery (powers camera operation) from charging (supplies power only to the battery). Therefore, “plugging in USB-C will charge the battery while shooting” is not a reliable general rule.〔G-PD-01, G-PD-02〕

USB Power Delivery conditions for the Nikon Z8

Set USB power delivery to ON in the Setup Menu, and connect the power to the camera’s USB Power Delivery port. The Z8 requires a battery installed in order to draw power from an external device; if the USB data port is mistakenly connected, external power will not be enabled. When the option is ON, the camera can be powered by external power while turned on with the standby timer active; when the standby timer is off, power usage switches to charging the battery.〔G-PD-01, G-PD-02〕

Choose power and cables according to the camera manual

Nikon specifies a minimum output requirement of 27 W (9 V / 3 A) for compatible USB PD portable power sources and requires the use of Type-C cables on both ends, connected to the designated USB Power Delivery port. The manufacturer also states that it does not guarantee that all third-party power sources and cables can power the camera or charge the battery. This requirement applies only to the Z8 scenarios described in the manual and cannot be directly considered a universal threshold for all cameras.〔G-PD-03〕

Long-duration shooting and external batteries

For Z8 cameras needing long-duration power supply, the Nikon manual lists the EH‑5d AC Adapter and EP‑5B Power Connector as optional power solutions; install and supply power according to accessory instructions. Do not consider unverified fake batteries, D‑Tap adapters, or third-party step-down cables as a safe universal guide. The manual does not support the older draft’s conclusion that they “can reduce temperature by several degrees” or “ensure no overheating”; thermal performance should be assessed individually according to the camera’s environment, shooting settings, and manufacturer instructions.〔G-PD-04〕