I asked about the same question on page 24 and was going to convert my Minolta to use Silver oxide batteries but the thread also covers the wein cell use and how it'd be cheaper to just buy the zinc air batteries and a rubber O ring to fit around it! This subject should be made a sticky to stay at the top of the page to be easy to find!! Or you could convert to a certain type of silver oxide battery to mimic the discharge rate of the old mercury batteries, Steve Smith is a nice guy and can give you the info you need to convert.He lives in the UK