I get about 18-20 hours of battery on my 2017 Oasis. During the day I read with the light all the way up, with a somewhat large font size, so lots of page turns. At night when the bedroom is dark, I set the light at 7-10 to start with, and turn it down more as my eyes adjust, never lower than 4-5.
Battery life is dismal, but I don't care. I plug it in every 3 days or so, and have chargers set up in two easily accessible areas. For me it's not a hardship.
Some days I pick it up to read 15 times or more for short spurts of reading, so the constant wake/sleep I'm sure chews up the battery too.
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