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Estimating usable time of a battery

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With a battery having its voltage V and capacity mAh,
its usable time t (hr) for an electric appliance having a power consumption W (Watt) is calculated as follows:

V*A/1000 = W * t

then,

t = (V*A/1000) / W (hr)

Note that efficiency should be considered for estimating actual usable time.


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t = (V*A/1000) / W
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