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Battery Power

August 9th, 2011

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How does the software on your computer know how much battery power is left in your laptop battery?

I am wondering how computer software can know how much battery power there's left in your laptop battery. Windows can see how much battery power there's left. But how can Windows seet that? How is the data transfered from hardware to Windows? Please someone explain that to me. =)

Hi, it's an approximation - ALWAYS. That goes for your mobile battery meterm your laptop meter, everything.

As a battery loses power it gives out slightly less voltage. Lets say you have a 13v battery, it might give out 12.9v when it's full of power, drop down to 12.6v when it's about 50% full and maybe down to 12.3v when it's empty. The manafacturer tests a whole bunch of the same battery to getaverage voltage outputs for say when the battery is 20%, 40%, 60%, 80% and 100% full. Then a volateg sensor is hooked up to the battery in question and the output voltage is measured against the preset averages to get an estimate.

Does this make sense?

There is some variation though. Some battery estimates will be way out of range and will wlays say it's full etc when actually it's empty, and vice versa.

Hope this helps

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