How does the software on your computer know how much battery-operated power is not here surrounded by your laptop freestyle?

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


Answer:

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



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



Does this make sense?



There is some flux though. Some battery estimates will be path out of range and will wlays influence it's full etc when actually it's aimless, and vice versa.



Hope this helps
I assume someone will come in near a more detailed answer, but I imagine there's a voltage sensor hooked up to the battery-operated that Windows has be told how to access and get information from.