It should be a lead acid battery.
The smell is coming from the battery, but is the battery bad or is something in the charging system causing the battery to go bad? As a start, I'd remove the battery (be careful and use latex/nitrile glove, and use eye protection just in case) which will be especially heavy if it's the house/coach battery, and take it to an auto parts store or battery shop and have them test it.
Herb
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SMB-less as of 02/04/2012. Our savings account is richer, but our adventures are poorer.
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