I have measured average battery drain current from four different OM4
cameras. The idle current "just sitting" there with nothing active, was from
20-25 microamps on three of them, and about 15 microamps on one of them.
That compares to 8 microamps for two OM4t bodies I measured. These numbers
have to be taken with a grain of salt, since the bodies seem to have a
'switching' power supply, and the instantaneous current drain varies
rapidly, and I don't have a true averaging microammeter.
If you assume a drain of 25 microamps for the average OM4, and a total
capacity of 150 mAh for a silver oxide cell, then the camera can completely
drain this cell in about 8 months. I think it would be well before this
point that the OM4 would refuse to work properly, but I can't really hazard
a guess at what point that would be.
Chip Stratton
cstrat@xxxxxxxxx
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