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.
In each cycle, the charging process stores energy in the battery in the form of potentially reactive compounds of sulfuric acid, lead and lead oxide. The discharge process is another chemical reaction among those components that release the stored charge in electrical form.he charging process converts energy supplied by the local utility to kilowatt-hours stored in the battery which is subsequently available for transfer to a load ... in our use, an electric fork lift truck. Two major components are involved in this process: the battery itself and the charger.