I just got a 920 and am having the heating/battery issue. It seems that the heating precipitates the wild battery drain and I am noticing that once the phone has heated once the battery is lost until the phone is shut off for a few minutes and restarted. Many people, including Nokia, have been trying to point the finger at various apps running in the background, and while I don't doubt that closing them has some effect, they really don't seem to be the reason for the extreme drain (i.e. 3-4 hours on a full charge) that many people have been complaining about. In my case, I have had it such that all apps have been closed via the back button and all background apps have been blocked and yet the battery still drained at an alarming rate - all that I could have done to cause this was play 'Wordament' for 20 minutes, after which I closed the game. The app caused the top-right corner of the phone to heat up and though it got less hot once the app was closed, it never cooled to room temperature - during this time I was losing 10% every 15-20 minutes. I plugged the phone in, it remained warm, and even once I unplugged it the drain continued at that rate. It was not until the phone was shut-off that it cooled down completely, and once restarted, the battery was fine (losing 5-6%/hour). It seems to me that certain functions of the phone have a propensity to over-work whatever hardware component sits in the top-right corner and that once this occurs, that component does not stop working above spec until it has been completely powered down and this is far too burdensome on the phone's battery. The only other major contributor that I have found is that the phone uses a lot of battery trying to establish optimal network connections where one does not otherwise exist. For the record, there have been days where the phone lasted me 20+ hours and on these days I played no games. Furthermore, and contrary to popular opinion, on one of these days where the phone lasted a long time I had NFC and Nokia Drive (background) running all day and neither, it would appear, contributed in any meaningful way to the drain. I have been testing this phone every which way I can since I started experiencing the problem (which was right when I bought it) and the only consistent contributor to rapid drain has been heat in the right corner, most often caused by gameplay and/or multitasking in my case, followed by dull heat and a dead battery. I suspect that it might be possible to fix via a firmware patch, but to date it doesn't even look like either Nokia or Microsoft know what the problem is. To my knowledge, Nokia has only ever said that Nokia Drive running in the background might be the culprit, which it does not seem to be. While I suspect that a multitude of apps, regardless of what they are, running at one time might cause the heat>drain combo, no single one has proven to be sole issue. When in doubt, power down and reboot.
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