There does seem to be a lot of variability in the drain characteristics of
the circuits that predate the '4T' type circuit. I've measured current
drains in OM4 bodies that definitely did not have a 4T circuit, and found
idle drains ranging from 15 to 30 microamperes. I think the 4T type circuits
run around 8-12 microamps.
My first Olympus, an early OM4, sucks around 20 microamps.
The idle current draw is a bit difficult to measure with precision since it
varies over about a 1-2 second period.
As cheap as the silver cells are when bought in bulk, I don't worry about
it too much anymore, I just replace them before an important shoot if they
are more than two or three months old, or if the weather will be cold.
Chip Stratton
cstrat@xxxxxxxxx
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