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BTW, hydrogen is a danger when the fan is moving - because that is when the battery is finally under strong recharge. A running engine is required to create enough current so that battery might release significant amounts of hydrogen.
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True but with the fan running and probably the hood up the gas doesn't accumulate. A stream, even a strong one, could ignite and scare the hell out of you. But it would not explode and would not backtrack into the battery setting it off.
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those heavy cables from battery to car frame do restrict current flow making battery explosion less likely or slowing down the time to explosion.
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Even a dead short should not cause an explosion because of the internal resistance of the battery becomes current limiting. The danger is at the contact points of the short. Arcing causes heat, flame, molten metal, etc. A friend of mine arced a 24 volt system with a wrench in his left hand and lost his ring finger by melting his wedding ring. Another danger of marriage.
