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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.
The main difference between a 4000 mAH and a 4400 mAH lithium ion  battery is that lithium ion batteries are designed to last longer.  These batteries are commonly used with â¦ in laptops.       A 4400 mAh battery has 10% more capacity than one rated at 4000  mAh.