Battery Question

reddesert said:

Ah, I see, the first chart clearly says AA in the caption and I glanced over that. The chart for the Ansmann button cell with a 22 Kohm resistor is at a steady current of 68 microamps which is much like what a button cell probably sees.

Here's some specs from Maxell for silver oxide and alkaline button cell batteries (click on the Specs tab): https://biz.maxell.com/en/primary_batteries/sr_coin.html The SR44 has a nominal capacity of 165 mAh and nominal current supply of 200 microamps, and the LR44 has a capacity of 110 mAh and nominal current of 100 microamps, which supports the usual statement that silver oxides have about 1.5-2x the capacity of same-size alkalines. I suspect this is one reason why camera manufacturers specified the silver oxide and tell you not to use the alkaline, especially in electronic shutters - it's not going to hurt anything (other than the meter accuracy), but it will die sooner and they don't want the user to complain about dead batteries.

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dynachrome said:

That's a good question. As I understand it, older cameras had no voltage regulator so they relied on the constant voltage output of mercury batteries. Where PX-13 batteries are concerned, I have used MR-9 adapters with MS76 or 386 1.5 volt batteries. The Canon F-1/F-1n and FT series cameras which have been converted for use with 1.5 volt batteries all work well. The same us true for the converted Minolta SRT cameras. I use 625A batteries in them. I have plain adapters without voltage conversion and with certain cameras I can use 675 zinc-air hearing aid batteries. They don't last terribly long but work. A silver oxide 625 would be nice for some of the converted cameras.

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