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Old 25th Nov 2020, 3:36 pm   #3
TonyDuell
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Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
Default Re: Large GPO? Battery Box what was its use?

There was a larger box, 'Box, Battery No 10' which I think could take up to 10 Flag cells. It was used containing 8 such cells as a power source for the Planphone if mains was not available

Bur I think the OP's box is too large for that.
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