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F4 DC supply voltage: MB-21 vs. MB-20?

Googlyelmo

Seattle, US
113 posts

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Googlyelmo Registered since 10th Oct 2012
Tue 04-Dec-12 10:47 PM

In mulling the perennial question about the use of disposible Lithium batteries in the F4, I had a few thoughts.

I have an F4. Now the MB-20 grip takes 4 cells, and the MB-21 takes 6 cells. What I wonder is what the supply voltages are to various items (4 motors, meter, LCDs, etc.) The concern about using lithium sulfate primary batteries has been damage from an over-voltage condition. But if the nominal supply voltage in the F4s is 9VDC (6x1.5V), and in the F4 it is 6VDC (4x1.5V), then lithiums at a nominal 1.85V per cell (so 7.4 from 4 cells) should be OK, assuming everything other than the grip is the same.

I'd love to get my hands on a Nikon service manual, or even just the electronic schematic for the F4 and the F4s. For now, I am sticking with best quality alkalines, but the above makes me wonder. Anyone know the nominal voltage supply numbers? Failing that, anyone either know, or willing to test, what a MB-21 loaded with alkalines gives for a voltage reading, with new cells?

--Will

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