Spud_Monkey
Senior Member
I never heard of frozen batteries exploding either in that manner, seen them crack open from being frozen. Technically you should start off with .10C to .15C which is tenth of it's rated AH based on 20hr rating, the starting off is called the bulk phase which max based on the formula I gave is bulked in, next is absorb phase in which the amps drop down to absorb amperage/voltage, then towards the last 10 percent it goes into float which is around the 10 amps or less depending size of the battery since lead has a lot of resistance of what it will take.The dozer batteries were manufactured just over 6 years ago Placed in service almost 6 years ago. They live in hot or cold as the weather brings. It hadn't been started in two months. It turned over a bit, but didn't start. I charged them on two different chargers, then tested. Neither was delivering its rated CCA. One is 100 under, the other is 150 under. Neither was frozen, both took charge.
I don't know if I've ever actually charged a frozen battery. Lots of times I've attempted to charge a dead battery, without success. I can't say I've heard of one exploding because it was frozen, though, I've never tried over a 10 amp rate.
In my opinion the battery was getting a high charge causing it to start off gassing hydrogen sulfide, a spark was created and someone ended up schitting their pants.
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