I have been on holidays for about two weeks and didn't have any battery problem there, even though wifi was sometimes on (and I was usually charging my N810 only during the night): at the end of the day, the battery was still almost full. Now, I came back from holidays, and after several hours in my lab, with wifi disabled, the battery was almost completely empty (while it was full in the morning)! The N810 was hot. Yesterday, the battery was half-empty, but I don't remember the conditions (I don't know if the battery drain occurred in my lab or later).

I still wonder what the cause is. I recall that I had never had such a problem with chinook. So, it could be diablo (or a configuration change due to the reflash) + something in the environment.

The temperature? The room at my lab is particularly warm. But I already had battery problems in the evening.

Also, the N810 is more often in my pocket, sometimes with keys near it (of course, the keys don't touch it, but there is a bit more pressure, and this also means that there's metal near the N810).

Notes was running, but the battery drain problem already occurred without Notes.