I actually noticed the same thing just recently on my PW4.
I normally exit KOReader and enable airplane mode when I'm done. Yesterday, only meant to take a short break from reading but became busy and the PW4 battery drained from ~80% to ~30% in, I believe, just 6 hours?
Stock reader, battery drain on the PW4 is worse compared to the PW3 but I don't believe it's quite 50% in only 6 hours bad.
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