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Battery explosions are due to the build up of hydrogen gas at the top of the battery.
We have done this analysis on bus batteries at work. BIG MESS !!
Make sure the water level is up there to minimize the head space for gas to build up.
It does take some kind of spark or overheat to get that gas to explode though. Severe negative plate/terminal rot can create local overheating. Look in there and see how bad it looks.
(It is almost always the neg side of a battery that rots out first.)
MTC. What you are seeing may be an indication that the neg side is rotting. Get a look inside if possible.
This is also why power plants and others that use large batteries have batteries with clear cases.
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