I just compared battery drain on my PW3-4GB wifi (5.10.1.1) and PW4-32GB wifi (5.10.1.2), wifi on, brightness set to 6, Bookerly, size 5.
I read three ~10K word chapters (I was doing my reading on the PW3 and just turned the pages on PW simultaneously). Drain was 3% on both devices and the occasional check does seem to support ~1% per chapter. Alas, I didn't take note of the time I started so no idea how long I read for.
As for charging, do note that even Androids and iPhones show full charge when they reach 95% and just do trickle charging so as to extend battery longevity. Leave it overnight or something and it'll get to 100% eventually.
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