When you have a battery and it shows you the milliamperehours and volts. You can use those to calculate the wattage. How can you test the battery to see if its wattage is accurate or if the company that is selling the battery is displaying inaccurate information?
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closed as too localized by Qmechanic♦ Jan 23 at 23:56
This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, see the FAQ.
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mAh $\times$ V = 0.001 A $\times$ 3600 s $\times$ V = 3.6 J (joule) -> energy, or using formula $$E = Q \Delta V.$$ You can check data on battery by emptying it. You put resistor on its ends, battery should be working for at least the following time $$ t = \frac{E}{P} = \frac{E R}{(\Delta V)^2} = \frac{Q R}{\Delta V}.$$ |
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The running time totally depends on your usage. If you have bought a 100mAh,12V battery. You are using it run a motor(RC Cars) of 50mA,12V it operates for 2 hours. If you are using it to power another motor of 100mA,12V it operates for 1 hour. If you are using it in a digital clock, 100uA(pretty huge for a digital circuit),12V, it takes around 1000 hours to discharge. Also, as you go on using the battery, it's discharge time does not vary linearly. |
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