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I've never timed battery drain on any of my Kindles. I'm retired and read a lot, so I've had to charge every one (K1, KK, PW1, Voyage, Oasis 1, and Oasis 2) often. Relative to my use, Amazon's estimates always were and are a joke.
However, yesterday I sat down with my O2 and knew I'd be sitting reading for hours straight, and it was freshly charged to 100% and it occurred to me to write down my starting time. The first time I took a break, I also wrote down the time. In 2 hours and 10 minutes, it lost 8%. That's with the screen at 16, font size 6, bold 1, and wifi on (I'm too lazy to keep turning it on and off and just leave it on).
Multiplying that out, it seems to me that's relatively good, and I suspect better than my O1, which has always annoyed me with the cover draining first, the naked device having very little battery time, and being unable to recharge the cover while reading on the device alone. I've never timed the O1 drain, though, just felt cranky about it.
None of it matters to me in a big way because I keep a charging cord plugged in next to the chair I read in and just plug the thing in when it gets low. One plus to the O2 is how fast it charges. I don't often take any of my Kindles out and about, and when I do, it's the O1 because I worry about losing a Kindle when out and never want it to be my current favorite. None of them ever ran out of battery when I was waiting for a car repair, etc.
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