what is ah in battery

Ah stands for ampere hour, which is a unit of measurement that represents the amount of energy charge in a battery that enables 1 ampere of current to flow for one hour. In other words, it is a rating indicating how much amperage a battery can provide for one hour. The unit is a useful metric to determine the capacity of an energy storage device, such as a rechargeable battery or deep-cycle battery. Large batteries are usually rated in ampere hours, while for standard AA and AAA batteries and other small batteries used in devices such as personal vaporizers and notebook computers, the rating is provided in milliampere hours (mAh) . The higher the Ah rating, the more energy charge a battery can hold, and the longer it can power a device.