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mAh stands for Milliamp Hour, a technical term for how much power a particular battery will hold.
So let's say that you phone uses 500 mA(Milliamp), not to say it does, but just as an example.
so 1500 mAh divided by 500 mA = 3 hours
and 2200 mAh divided by 500 mA = 4.4 hours
Bigger the number longer lasting power.
That 2200 mAh battery makes you replace the cover to fit it, so your phone is fater.
-Polen
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