Nikon F 4 - Power Sources

POWER SOURCES
Nikon External Power Regulator MB-22
The MB-22 consists of the grip portion MB-21G, in common
with the MB-21, and the bottom portion MB-22B. The terminal
enables connection with Nikon AC/DC Converter MA-4 via
Nikon External Power Cord MC-11. A regulator, which converts
the 15V current of the MA-4 to 8.2V, and a remote terminal are
provided.
Nikon Multi-Power High-Speed Battery Pack MB-23
The complete system consists of unitized battery pack/hand
grip assembly and one-piece battery tray MS-23 for AA alkaline-
manganese batteries or optional NiCd Battery Unit MN-20. A
remote terminal and the terminal for MF-24 back are provided
for the MB-23 as well as battery checker LEDs. Optional Quick
Charger MH-20 can charge up to two MN-20 units sequentially,
operate automatically with voltage from 100V to 240V.
Nikon AC/DC Converter MA-4 and External Power cord
MC-11
Especially recommended when using the F4 for extended
studio use. Supplies constant 15V DC current to MB-22. The
MC-11 Cord plugs into the external power terminal of the Nikon
External Power Regulator MB-22.