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Vehicular Battery Off-gassesYes, when a lead-acid battery is either charged or discharged it emits gasses [vapors].

Although there could be others, the primary gas is Hydrogen [H2], and sometimes Hydrogen Sulphide [H2S].

If and when mixed in the proper ratio with the air, both of these gasses are highly explosive!!!!!

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Q: Are the vapors emitted from a car battery explosive?
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