The battery is in the boot!
so you are saying that if you never topped it up with water the smell of sulphur would magically disappear and not enter the cabin ?
Its not likely as it has a sealed lid to its compartment and is maintanance free anyway. Cant see how this would give him a lumpy tickover either..
at the end of the day its guess work but can he drive it saftly to a garage........well i wouldnt put my head on the block