That's the expected battery drain for a B300 SoC that does *not* enter standby properly, FWIW.
(i.e., if this were not an Android device (i.e., the Sage/Elipsa, or the Libra 2, which is an NXP SoC but has terrible PM for some reason), enabling Autostandby in KOReader would "fix" it to a more sensible (still relatively bad, but much "better") power drain).
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