My New Oasis also seems to be going though the battery much faster than any of my previous Kindles (2nd generation, Paperwhite, original Oasis). I did the Indexing Test and found “Text In Books” was grayed out. I have brightness set to Auto.
I recorded start and stop times (typically 20min to hour reading sessions). I was down to 26% after 5hrs 25min of reading. That extrapolates to about 7hr 25min total battery life. That is nowhere near the 21hours you would get for 6 weeks, half hour a day. Granted that is at a brightness setting of 10. I have no idea what my typical brightness setting would be on Auto, but i checked a couple of times. Once was 18, another 11. I did have WiFi on during this test.
I certainly expect my results should be less than what they advertise, but I think this is extreme. I recall only charging my other Kindles every 2 or 3 weeks.
Cheers, Joe
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