We charged 8 12 volt batteries connected in series/parallel for 24 volts for cold room tests. We would check all the battery cells using a hydometer before installing in a vehicle. Then we would cold soak the vehicle for 24 hours at -50 F. Once we were at this temp we would pull the batteries at this temp & let them thaw for 24 hours before charging. This was on an M60 Tank. They weren't good at starting at that temp. We did a Soviet tank to -65F and used the same batteries for 3 starts. It was their preheat system that made the easy starts. Hal PS: Here's a hydrometer like we used. They gave me this when I retired.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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