Quote Originally Posted by BMbikerider View Post
Mind you I did have reasonably good luck with the OM2SP when I remembered to turn the Shutter speed ring around the lens to the 'B' position when I had finished and this seemed to stop all battery usage when it wasn't being used and not just 'switched off' and the batteries lasted a lot longer.
The above method doesn't work and does nothing to conserve battery life. The only thing it does is disable the metering system from turning on when you press the shutter button half-way down.

However, battery technology has come a far way since the 80'ies. You can replace the SR/LR44 button cells with single-cell 3 volt Lithium ones which last a lot longer. My OM-3 "runs" for months at an end with such a cell. And my 4Ti hasn't needed a new cell for 14 months.