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It looks like a defective unit.
Boyue uses Rockchip socs on their entire line. They're known to perform very badly keeping battery on standby (vs. Snapdragon or NXP/Freescale). That cannot explain the screen time you got. It should be at least 10x even with a RK3368.
ottischwenk made a good point about broken ebooks that happens on all Boyue devices: there's a vendor service paired to the android MediaScanner that will try to read metadata from books you've put on discoverable places on the device (ie: all writable folders, except those with ".nomedia").
The service runs even if you changed the launcher (albeit uselessly, because the info it crawls cannot be repurposed by any other app). It should take less than 1s of cpu time per book, but if it fails it will add the book again to the end of the queue becoming an endless process)
If, before factory reset, you put thousands of books inside, try your screen time again. To see if it improves.
If you're annoyed by standby battery dry your best bet is to return the unit and never look at Boyue again.
Onyx uses Snapdragon socs on their recent models. They have a way better standby time. It is still a mobile soc running Android, so there's no point to compare with a proper ereader, built on a industrial grade soc.
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