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by userbinator 846 days ago
If it was the UPS then that may have been a rare allergy to something.

Lead-acid batteries contain H2SO4 and can emit H2S when being charged vigorously; the latter is definitely not odorless, and the former won't have a smell but instead produce a burning sensation if you did inhale any vapors (which is difficult, since it has a very low vapor pressure at room temperature.)