Sounds like you ran the battery dead to many times and had heavy lead suphate deposits, when those flake off they can short out the plates and cause the battery to just heat up instead of charge.
There are no good products out there that fix this problem, you could try to dump out the acid along with the lead sulphate, filter it and put the acid back in, or put new acid in, but if you try that you need to be very careful because the acid is strong enough to burn skin and make you go blind if it gets in your eyes, it will also etch concrete and destroy clothing that it comes in contact with, so treat it as if it will kill you because it could, if you get it on your skin baking soda is the way to treat it, dumping baking soda in a large enough puddle is a very bad idea, but if you get acid on any part of your body fresh water and baking soda will help stop the burning.
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