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Ampere-hour (Ah) is the quantity of electrical energy equal to the flow of one ampere of current over time. Typically used to quantify battery bank capacity.

The ampere-hour is frequently used in measurements of electrochemical systems such as electroplating and incorrectly, the ‘capacity’ of electrical batteries (a battery constituent material’s specific capacity is commonly expressed in mA·h/g). The commonly seen milliampere-hour (mA·h or mAh) is one-thousandth of an ampere-hour (3.6 coulombs). This is commonly used for marketing purposes, but it does not express the real capacity of a battery.

A milliampere-second (mA·s) is a unit of measure used in X-ray imaging, diagnostic imaging, and radiation therapy. This quantity is proportional to the total X-ray energy produced by a given X-ray tube operated at a particular voltage.[2] The same total dose can be delivered in different time periods depending on the X-ray tube