In my experience Ken is correct that however you suspend in Koreader, because it has no override of the magnetic cover function that function is always active if one is using a magnetic cover.
My testing to date has shown me 3 things on my 2 readers:
1. Koreader has a significantly higher battery drain in suspend mode than nickel or Coolreader.
2. Using the Coolreader suspend script made no improvement on my readers.
3. Having a magnetic cover seems to lead to even higher drain + the reader seems prone to waking up with movement when the cover is closed.
I have wondered whether the fact that the magnet recognition is always 'On' in Koreader might be a factor in its higher battery drain (whether using a sleepcover or not), but that is pure conjecture.
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