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Originally Posted by jhowell
I don't want to disclose too much about my methods, but this is based on my own observation of data coming from Amazon, not rumors from others.
Since I first posted about this I have been able to determine that the cutoff point appears to be PW1 (5th gen) and older devices. Basically, they are now lumped into a category related to e-book delivery that originally contained only the older K4A app versions reaching end-of-life later this month. This is an indicator of something, but I cannot be certain of what it really means.
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As always, you are a fount of enlightenment
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If it was me I would not upgrade the battery at this point. The most important thing to do with older Kindles is to never let the battery go completely dead. Many people put them in a drawer and forget about them for months or years. If you keep the battery topped off periodically I suspect your K4's battery will last for years.
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How bad is it if it reaches the "low battery" screen?
I do top off the battery every month or so, but increasingly when I go to do it, it's at the "low battery" screen. It always starts charging immediately once I plug it in, and charges to full in a few hours, but it now reaches the "low battery" screen after about 3 weeks when not in use.