My problem is not too different from yours. My Aura Edition 2 would have these mysterious power drainage, i.e. after reading 30 minutes the device would lose 10 to 15% of power. Other times I could read for an hour with only 1% drainage.
I did the usual ... factory reset, upgrade firmware and re-calibrate the battery. Nothing seemed to work. My device is only 2 months old, so I suspect maybe a defect in the battery or component/wiring problem. Currently, I'm in the process of returning the device under warranty. I'm thinking my problem maybe hardware, not software.
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