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Oh I just did a fully charge the first time I got my Paperwhite. It last very long and I just want to know how long i can last. When the battery is nearly empty, I found that it sometimes not responsive. I thought it could be 5.4.0 so I upgrade to 5.4.2. I was wrong, 5.4.2 did not make it more responsive and it's worse than 5.4.0 with things like "Cloud collections". And now when it's fully charged, it's very responsive and works fast.
I think Amazon applied some tricks like "power saver" and slow down the CPU and the responsiveness of the screen to save the battery.
So anyone with 5.4.0 should stay with it. And charge the kindle when its battery is below 50%.
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