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Amperage is the disfavored term for "current:": the strength of an electric current in Amperes (Sometimes shortened to Amps).
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How much current does a battery store?
I have always been confused when it came to how much charge does a battery charge.
Let's say, a phone battery:
It says 1900 mAh @3.7 v.
Now i know it goes up to 4.2v, but those 1900 mAh are available …