My completely unscientific (ie, haven't kept track of pages read or time spent reading) update is: if you suspect or feel like your battery on the PW4 is worse than on your previous PWs, try turning off Bluetooth. This has seemed to me to make a huge difference. (Ie, have recently read half a book and am only at 82%.) I have no idea why that would make a difference, as I haven't accessed the BT to listen to one of my audiobooks, but give it a go.
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