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milliampere-hour

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**milliampere-hour**

A milliampere-hour (mAh) is a unit of electric charge commonly used to describe the capacity of small rechargeable batteries, such as those found in smartphones, tablets, and other portable electronic devices. It indicates how much current a battery can deliver over the course of one hour. For example, a battery rated at 1000 mAh can theoretically supply 1000 milliamperes of current for one hour, or 500 milliamperes for two hours. Understanding mAh ratings helps users gauge battery life and choose devices or batteries that meet their energy needs.

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