I rarely have the Clara HD sleep for a long time without the cover closed. There hasn't been an issue with the battery draining. And I just checked it. I last used it about 24 hours ago. At that time, I connected it to the PC to while transferring a book to it. Then I disconnected it and closed the cover. I just opened the cover and it is at 99%. It was probably fully charged when I disconnected it.
I do get an occasional unexpected battery discharge from my devices. But, it almost always happens in my work backpack. I have come to the conclusion that the magnets in the covers of the Aura ONE, Clara HD and iPad can interfere with the other devices and prevent them from sleeping. I think the iPad cover is the culprit as it has more than one magnet and they seem to be stronger. And that it depends on exactly how they all sit together in the bag.
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