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What Is mAh? mAh means milliamp Hour and is a unit that measures (electric) power over time. It is commonly used to measure the energy capacity of a battery. In general, the more mAh and the longer the battery capacity or battery life.
For example, if you draw 1 mA for 1 hour from a battery, you have used 1 mA Â· 1 h = 1 mAh of charge. If you draw 2 mA for 5 hours, you have used 2 mA Â· 5 h = 10 mAh. You can approximate how long a battery will last by dividing its total charge (in mAh) by your nominal load current (in mA). Say you have a 1800 mAh battery, and you connect it to a 20 mA load: