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.
Gordon B has it dead on. Each cell in the battery when fully charged produces 2.1 Volts. Multiply that by six, and a fully charged battery produces 12.6 volts. When the alternator is charging, depending on the state of charge for the battery, at approximately 1500 RPM, the voltage should be 14.5 to 14.9 Volts.hen the battery is fully charged and the engine is OFF, the nominal voltage across the battery is approx 12.6 volts. With the engine running (above 1000 RPM) it should be 14 - 14.6 volts.