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.
1 Charge Voltage-The voltage of a battery while charging. 2  Discharge Voltage-The voltage of a battery while discharging. 3  Again, this voltage is determined by the charge state and the current flowing in the battery.