Kindles, by their nature, typically undergo far fewer charge cycles than a smartphone, which might get hooked up to charging several times a day. I doubt it is of large concern for a Kindle, provided you don’t let level get too low before charging it up.
For example, in forthcoming iOS 13, Apple is trying to prevent full charge from happening more than once a day, so as to slow battery aging. It goes to 80%, and to full charge as you approach heavy usage period.
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