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Old 12th Aug 2018, 12:31 pm   #28
Radio1950
Hexode
 
Join Date: Apr 2017
Location: Buderim, Queensland, Australia.
Posts: 428
Default Re: Nickel Cadmium vented cell battery, advice sought

If I remember correctly, a few Australian aviation ground DME's used a 42 volt battery of "NIFE" brand wet nickel cadmium cells, some up until about 1990, as standby power.
They were rugged and reliable, and would last almost forever.
They were about 30 x 100 mm and about 250 mm high, in a light blue plastic case.


I had to clean up a bank once in North Queensland.
I seem to remember they had terminal posts with an unusual thread (for its day), ie BSF, as I had to buy a tap and die-nut.
And we refilled the electrolyte.
A special hydrometer was used, not so much for checking state of charge, but to make up the replacement electrolyte.
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