Quote:
Originally Posted by Mario1up
Li-ion batteries have no memory effect at all, so that's nothing to worry about. They can, however, be damaged by being drained too low.
But, there are two forms of protection in the Kindle. One, that all li-ion batteries found in commercial devices have, is a protection circuit built in to the battery. This will prevent the battery from draining any more if the voltage gets too low.
The other is the software. Once, by accident, I let the battery drain all the way. The Kindle put up a screen that said the battery was too low and it needed to be recharged. It was just that screen, nothing else. I couldn't do anything until I plugged it in for a while.
So while you won't severely harm the battery, it's a good idea to not let it drain past 20%. Remember, li-ion batteries don't have a memory effect, so you can charge them whenever you like. It'd be a good idea to just plug your Kindle in every night.
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Interesting, I didn't know about the warning screen. Usually I let the battery get to full charge when I plug it in and use it til the battery icon shows a sliver of charge at which point I plug it in again to recharge. Haven't seen the warning screen yet so I must not have gotten it quite that low or something.