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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.
Report Abuse. 3000 mAh means: 3000 milliampere-hours. So your battery can supply 3000mA for 1 hour, or 1 mA for 3000 hours. It is really a measure of the chemical energy stored in the battery. There is no conversion to voltage.You must buy a battery that has the same voltage as the device that you are attaching it to is rated for.o your battery can supply 3000mA for 1 hour, or 1 mA for 3000 hours. It is really a measure of the chemical energy stored in the battery. There is no conversion to voltage.