For faulty battery reading, I noticed that on numerous devices, not just kobos. Even my cell phone (or mobile, however it's called in your country) was stuck in 55% from different apps for battery monitoring for days, till I "forced" reading.
What I want to say, it really can be something deeper in system (i.e. linux), not koreader related.
Only real problem I see here is that koreader's suspend script doesn't enable device's battery to last as long as it last with nickel or CoolReader. On the other hand, I have workaround, to shut device off.
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