[LargeFormat] more on batteries

[Clive Warren]

At 9:58 am -0800 12/12/00, Don Wilkes wrote:
>I've found an article that outlines some of the problems and solutions with
>replacements for mercury batteries.  See especially the second page:
>
>http://www.acecam.com/magazine/battery1.html
>
>I think I may prefer the adapter/Silver76 solution...
>
>\donw

Hello Don,

Think I must have missed the previous postings - just back from a few 
days away.

The URL above did not work for me.

A quick recommendation - I bought a silver oxide battery to mercury 
converter a while ago. This uses a Shotky diode to bring the 1.5 
silver oxide voltage down to approximately 1.3 volts (cannot remember 
the exact voltage offhand).  Although the voltage is not exactly 
1.35v, the converter was accurate enough to resurrect some old 35mm 
kit lying around here.  The converter is the same size as, and 
replaces PN625, PX625, HD625, RM625, 4625, H-D and MR9 1.35 Volt 
batteries.

Essentially if the metering circuit uses a bridge design then any 
replacement battery type of around the same voltage will do the 
trick.  Things get a little more tricky with other electronic circuit 
designs. This can be a real problem with some light meters and 
cameras.

-- 
All the best,

             Clive Warren   http://www.f32.net
                            Large Format travel and stock photography