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mAh (milliampere-hour) is a unit of electric charge commonly used to indicate a battery’s capacity—how much energy it can store and supply over time. Specifically, it represents the amount of current (in milliamperes) a battery can deliver over one hour. For example, a 3,000 mAh battery can theoretically provide 3,000 milliamps for one hour or 300 milliamps for ten hours. Higher mAh values generally mean longer battery life, depending on the device’s power consumption. This measurement is frequently used for smartphones, tablets, power banks, and other portable electronics to compare battery performance.
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