I've run into a few covers where the magnet wasn't in the exact perfect position to trigger sleep for the reader. If you pry up just an edge of the cover, you'll see the light is still on. I've returned them, and the replacement worked just fine.
I would take the reader out of the cover for a few days. Either set it to go to sleep with the button (I don't have a Clara, so I'm assuming it's sleep and not a full shut down). Or in the settings, set it to go to sleep after 5 minutes, and make sure it really does go to sleep. See if it's still having the same battery drain issue, just to rule out that it's not the new reader itself. But I'm betting it's a sleep cover with the magnet just slightly off the sweet spot.
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