I have two OM-4 and one OM-4t.
One OM-4 when 'off' averages a 20 uA drain, the second OM-4 is 15 uA, and my
OM-4t averages 12 uA (these figures may be off a couple uA on the high
side).
The first one drains more than you would like, but is well less than the
worst examples out there.
The silver cells have about a 125 milliamp-hour capacity. Therefore, the 20
uA drain would use about half of the battery in a bit over 4 months of
sitting idle, while the 4t would use the same amount in a little over 7
months.
I don't know how much remaining capacity the battery needs to perform high
current chores like actually making an exposure - I suspect the battery can
be down well below half its capacity and the camera will still perform
normally - but these figures should be helpful.
BTW, I measure about a 300 uA draw when actually metering - which isn't much
really when you consider how little time the meter is actually on. You would
have to have the meter on continuously for over a week to draw the battery
down to half capacity.
Chip Stratton
cstrat@xxxxxxxxx
> The small amount of current necessary to keep alive the circuitry which
> detects when you touch the shutter release to turn on the meter. In an
> OM-4T it's around 10uA, or less; not much, but enough to drain the
> batteries in a few months.
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