On 30/07/2018 13:34, Martin Brown wrote:
A fresh silver oxide one should be around 1.6v under no load. See

Silver Oxide batteries would be SR44.

LR44 are normal lithium batteries, and should be about 1.55 volts
when fresh.

Beware of using LR44 in place of SR44 in an older film camera
because ony the SR44 batteries can deliver the current necessary
to activate the mirror-up and shutter. Expect many, many
pointless arguments with a holes at carboot sales who will try
and convince you that they are 'the same'.