Battery capacity (AH) is defined as a product of the current that is drawn from the battery while the battery is able to supply the load until its voltage is dropped to lower than a certain value for each cell. Capacity of batteries usually expressed in Ampere Hour (AH).
122) The capacity of a battery is usually expressed in terms of
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supply a large amount of power to turn the starter motor when the engine is being started.
Hydrometer is an instrument used to measure the specific gravity or relative density of liquids, i.e. the ratio of the density of the liquid to the density of water. Hydrometers are usually made of glass and consists of a cylindrical stem and a bulb weighted with a heavy material to make it float upright