I generally agree with the advice others have offered.
Last year, I went through a rather torturous issue with a cell phone battery that caused me to become a bit paranoid about batteries in general. So this is something that I worry about (probably too much).
Unfortunately, the battery charge status is not displayed continuously on a Kindle (I wish it were). So periodically (every two or three days), I 'pretend' to want to go to the Library page just to turn on the battery display. When I see that the battery level is below 40%, I put it on the charger and leave it until the green LED comes on. That seems to happen around 95%, and I try to be alert enough to stop charging when that happens. However, sometimes my attention is distracted and it does continue to charge for a while, but I try not to get hyper about that.
Kindles are notoriously frugal when it comes to battery consumption, and my experience is that I only need to charge about once a week, even though I may use my Kindle several hours every day. You can extend the charging cycle by putting your device into 'airplane mode' which turns off both WiFi and Bluetooth. I don't do that when I'm at home because our home WiFi is on all the time, but I have developed the habit of going to airplane mode if I'm going to be traveling from one location to another for several hours. This practice is based on my cell phone experience that batteries drain faster when a phone is outside cell coverage; I suspect a similar phenomenon applies to Kindles and WiFi.
Kindles weren't designed to allow battery replacement, and Amazon doesn't recommend replacement even though there is at least one battery supplier who sells replacement batteries. That supplier has produced a YouTube video illustrating how to disassemble a Kindle to access the battery - in my opinion, the disassembly process is close to being destructive, so I would not try it myself. The information I have seen suggests that the battery in a Kindle should last many years. Given that new models are being introduced every couple of years, and the price of a new Kindle is not that much greater than the price of a replacement battery, it seems to me that replacing the device when the battery ages to the point where it can no longer hold a charge, is probably the optimum ownership approach.
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