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One full month of using the PW4
Launch Day: I started from scratch, importing only a few collection folders. I did not download any old books to be indexed - just one or two that I wanted to read, My first charge was the afternoon I got the device - Wednesday, November 7th. It unplugged it probably shortly after it turned green and the charge showed 96%. Oddly enough, when I started reading that night, it showed 98%.
The first two weeks: I read nonstop every day for several hours, longer than the 30 minutes usually listed by Amazon. I probably read more books than usual during this time.
The second two weeks: I read on and off. In average, this worked out to my normal rate of usage.
Wi-fi was kept off except to download books (which I did almost daily), Bluetooth has never been used, and the light remained at 10. If I ever read in the living room, I'll probably raise it to 14 like I did with the PW2, but that's only for very short bursts.
Tuesday 12/4: The battery dropped to 10% and I got the warning that my Kindle needs to be charged. So, now we know how much % is left when this message is triggered.
Wednesday night 12/5: Oddly enough, the battery was back up to 11%. Still, I charged it for roughly two and a half hours (the light probably turned green before then) to 100%.
So, it looks like I can get roughly a month between charges, which is what I was hoping for. My fears of the terrible battery life that plagues my sister's Oasis (even after a replacement) were thankfully unfounded. I have no idea what the charge time would be like if I kept wi-fi on all the time, as that's something I've never done on any of my Kindles.
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