With battery pack mb-20 – Nikon F4 User Manual
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With Battery Pack MB-20
Rotate battery pack release lever counterclockwise (to g), and remove battery pack.
Install four AA-type alkaline-manganese
batteries with terminals positioned as
shown inside battery pack,
Attach battery pack to camera body and turn release lever clockwise until it stops.
Batteries with a "-I-’’ terminal
that exceeds 6mm in diameter
cannot be used.