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Re:“Space age electronics”: Inside a GE thin-film paperweigh... by simonblack on Friday July 02, 2021 @07:16PM (#27718013)
Impressive how little that battery leaked over all those years

It was very likely one of batteries where each 'cell' looked like a block of compressed charcoal, about an inch or two square, with a strip of plastic around the edge. When I was a kid back in the 1960s, we used to pull these apart and throw the cells around like stones.

The most common size radio battery then was a 45 v battery, about 7" x 5" x 2" (IIRC) with a small socket in the top of it. https://www.flickr.com/photos/unclegal/31122957375

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