An interior door does not have to withstand extreme weather changes. Interior and exterior doors are not the same product sold under different labels. The construction of each is different, with exterior doors given special treatment to stand up to the elements and frequent use.
The charging of lead-acid batteries can be hazardous. However, many workers may not see it that way since it is such a common activity in many workplaces. The two primary risks are from hydrogen gas formed when the battery is being charged and the sulfuric acid in the battery fluid.
A too-high charging rate (above 15 volts) will cause the battery to produce more sulfuric acid fumes. These fumes combine with the lead of the battery post and make the corrosion. The corrosion isn't a good electrical conductor. A crack in the battery case can allow the fumes to escape, also.