Some old manuals

Ahh, that's the compartment I can't get into due to corrosion. The bottom left screw is corroded and rusted tight. I'll try and get into it one day. I can't say I'm looking forward to the mess that is in there.

I have made a couple of button cell packs, one quite recently. I needed a 25v battery for an old microscope exposure meter. I found them on ebay but were quite expensive (£16 IIRC) so I just ordered a card of cheap batteries, put them in a line and wrapped some tape around them. It works pretty flawlessly. I actually expected bad connections with the cells just stacked, but worked very well.

I have an old Dawe sound level meter that I need to make a 30v battery (pictured) for at some point. Maybe I should document it's construction?

 

I don't see any reason I can't make new batteries for this meter, if the battery holders and contacts are salvageable. Or maybe modify it? If the battery housing is beyond repair it may be worth modifying it. I would be interested in seeing one of these working, especially as you mention the Americium check source for them.

I have ordered 100x LR1130 batteries. Enough to make 2x B123 batteries. I should be able to knock up some documentation when I build a battery.