A battery's capacity is the amount of electrical charge it can deliver at the rated voltage. The more electrode material contained in the cell the greater its capacity. A small cell has less capacity than a larger cell with the same chemistry, although they develop the same open circuit voltage. Capacity is measured in units such as amp-hour(A-h). The rated capacity of a battery is usually expressed as the product of 20 hours multiplied by the current that a new battery can consistently supply for 20 hours at 20'C while remaining above a specified terminal voltage per cell. For example, a battery rated at 100Ah can deliver 5A over a 20-hour period at room temperature. The fraction of the stored charge that a battery can deliver depends on multiple factors, including battery chemistry, the rate at which the charge is delivered, the required terminal voltage, the storage period, ambient temperature and other factors. The higher the discharge rate, the lower the capacity. ...
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