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1989 Ford 150 4x4, various lawn tractors
123 Posts
When I worked as a class 7/8 mechanic we were taught never to charge a frozen battery or to charge one that had swollen sides from freezing because the plates become disconnected internally with low battery fluid you can see what a big bang looks like if you try a 50 amp boost.

If you charge a battery and it shows a cell missing (example: 10.5 or 10.8 etc.) you know just to let it sit for a couple of hours before removing the cables and junking it.

It is possible for a cell to go bad in a battery and for the battery charger not to recognize it and to keep charging it until the fluid boils away and the battery explodes. I had a battery tender (1a at 12v) nuke a marginal battery, luckily I caught it once I saw fluid boiling out of the battery vent before it exploded.
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