For my part, though my cover is non-Kobo, it is not flimsy and the closed cover is also held in place with a strap.
I would close the cover at night, ensure the light went off and then place it on my bedside table. Wifi off. The next morning I would see battery drain of anywhere between 1% and 20%. Non-use drain during the day was similar. This was a consistent pattern of behaviour with different books for over a month. Eventually, I switched off the sleep-cover mode and the excessive battery drain stopped.
I have no idea why a unit which went to sleep and was left on a table should show such inconsistent battery drain, but I am happy with not using sleep-cover mode.
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