Quote:
Originally Posted by compurandom
It's very dangerous (to the health of the battery) to let it go totally dead.
So the charge control chip stops letting the device drain it somewhere just below 10%, and it reserves this last little bit to keep the charge control chip going and to keep the battery well away from the dangerous 0 point where it could reverse polarity fatally. Typically the battery can sit there for a month before it hits 0 anyway.
Either that, or it's the power the laptop manufacturer reserves to allow enough power to shut down cleanly or hibernate before there's not enough power to keep it on. (Depending on your context obviously.)
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Would you please tell me where you got this from? So far, I haven't seen a device or laptop that couldn't run down to what it shows as 0%. I know that this is above the danger voltage below which is dangerous to recharge from. But, every single one of my laptops I have managed to keep running until that just turn off. Some do have something that kicks off a shutdown, but, that isn't always successful. Which I actually believe is part of Windows. Same goes for the phones in my household (especially my wife's).
And this goes especially with batteries with a lot of wear. I have used laptops with batteries that only had a few minutes of power. Just enough to unplug, move to another room and plug in. If this "reserve power" worked the way you suggest, these would initiate the shutdown as soon as they were unplugged.