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December 12th, 2005

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How much electricity will be used to charge a 4000 mAh battery?

i tried many to search it but cannot find a straight answer
so here is my question how many unit( kwh) of electricity will be used to charge a 4000mAh laptop or any other battery.
if further details are required
its 10.8V li ion
electricity on grid is 240 V50 Hz.

4000 mA = 4A.

It delivers 4A for one hour, at 10.8 V.

That's 4 x 10.8 = 43.2 Watt hours, or 0.0432 kWh.

It will take 0.0432 "units" (as you call them) to charge the battery, assuming 100% efficiency.

I pay $0.12 per kWh, so to charge that battery would cost me $0.12 x 0.0432 = $0.00518.

If I charged it 10 times, it would cost 5 cents.

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