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Originally Posted by davidfor
I'll stand by what I usually say: "Just use it". Anything you can do to extend the overall lifetime of a Li-Ion battery is a nuisance and means you aren't actually using the battery. And generally, doesn't have enough effect to be worth it. Use it as it is convenient, charge it when convenient.
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I agree, which is why I suggeted the 40-100% range. It really just means you top the battery off on a regular basis rather than waiting for it to go dead.
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And sorry, but what the hell is "reserve power"?
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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.)