Nikon F4 Instruction Manual page 16

With Battery Pack MB-20
Rotate battery pack release lever counterclockwise (to
e ),
and remove battery pack.
Attach battery pack to camera body and turn release lever clockwise until it stops.
16
Install four AA-type alkaline-manganese
batteries with terminals positioned as
shown inside battery pack.
Batteries with a "+" terminal
that exceeds 6mm
in diameter
cannot be used.