Quote:
Originally Posted by j.p.s
100% is an arbitrary point and the battery is not really full at 100%, but beyond that the battery life will be reduced, and far enough beyond the battery can explode. The 100% point is selected as a compromise between as full as possible and as full as safe.
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To make this even more pointlessly complex, the percentage shown on the Kindle battery bar is, ah, not actually an accurate representation of how full the battery actually is. Judging by the way the percentage counter sometimes stalls without moving, I would guess that the battery actually finishes charging at about "120%" (but the indicator is capped at 100%) and the Kindle powers down for lack of power at about "-20%" (but the indicator is, obviously, capped at 0%).
A clearer way of putting this might be to say that when the indicator says 99%, the battery is actually at more like 80% of safe capacity: when it says 0%, it's at about 20%. Ish.
(Battery circuits these days are very safe: it is almost impossible to damage a lithium-ion battery unless you do something like stick it in the oven or the microwave or stab things into it, so don't do that. Merely using it as designed, charging and discharging it, is not going to do it any harm, though if you discharge it all the way and then leave it that way for about a year, you may find there is not enough power to run the battery circuit and you need to leave it on charge for a *long* time, a week or more, before it picks up enough charge to come back to life again.)