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Both my Aura HD and Mini have suddenly discharged completely from fully or half charged state and were not connected to anything while doing so. Different firmware versions so I am not inclined to put the blame there.
It is annoying but has happened only three times total in a year.
When I first got my mini (Oct 2012) I used to keep track as it could stay at 97 % for days or drop 10% in an hour. I calibrated, reset etc, and could not find a pattern.
With Wifi and light off you should get close to 30 hours reading, but I wouldn't about less than 25 or perhaps even 20 if the light and wifi are on.
My experience has been that the meter percentage shown goes down faster at a lower level, but I have seen an initial drop of 20-30% on the HD while loading content or a firmware upgrade. Used to almost always do this, and maybe still does. But I would recharge in a disconnected state and it would be good for pretty close to the 30 hours or longer.
A good test would be to read for 10 hours and see where the battery level is. Should still be over 50% unless it goes into fibrillation mode with the little boxes.
Helen
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