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Battery University says that the optimal way to use lithium ion batteries is to keep them between 40% and 60%. Or maybe it was 40% and 70%. It's been a while since I read it.
The saving grace is that these batteries are pretty tough and all these optimizing things only have a small effect. I don't worry about it much.
I typically charge my Kindles to 100% and I rarely let them get below 75%. I usually charge them around 85%. This is for convenience since I have a number of Kindles and I check the ones I'm not using every week or two.
I've been using Kindles since 2009. I've probably owned something like 20 of them in that time. I usually give older ones to my neighbors in my retirement home and I'm always helping them with them so I'm still in touch with most of the ones I've ever owned. In all that time only one has ever had a battery get to the point where it won't keep a charge very long, and it's still being used by the woman who cleans my apartment. All the rest are doing fine. I think these things are pretty reliable.
Barry
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