I got my Lumia 920 black on this Tuesday. I find that it turns warm/hot with some particular apps running. Most Nokia apps can make it hot very fast (in one minute), like Nokia maps (if you keep zooming in/out, dragging, checking the venue maps), City Lens, Nokia Drive+ Beta. It usually get to the temperature that higher than my body (About 45 degree Celsus?). I know that a lot of guys here also complain about the heat problem. But how hot is your 920 and what are you doing when it gets hot? Is the temperature I got normal? Is a replacement necessary for me?
Other apps will also warm up Lumia 920 a little bit but not as quickly as those Nokia apps. The temperature will not be as high as with the Nokia apps.
And the heat problem becomes severe during charging.
I initially thought the heat was coming from the battery discharge. But after checking the photos of dissembling Lumia 920, I find the heat focus at the processor (top half of the phone), not the battery. Another point that may worth to make is that the heat doesn't seem to be from Wifi transmission because: 1. I got the heat problem even playing with downloaded maps in Nokia Map. 2. I tried watching Youtube video for about 20 minutes and the heat is much less than playing Nokia Maps for 2 minutes.
I guess the reason would be the lack of code optimization for those Nokia apps (probably other Mango apps too). We know that most of those apps have versions that can be run on Mango or even on Symbian. It is possible that they just did a quick porting to WP8 in a limited time without fine optimization. Maybe a release/update version can do a better job.
Now about the battery life, for the first charge, I got a 2-day-1-night duration with light usage (check emails occasionally, 1-2 phone calls, installed about 5 light apps (like Bank of America) and tried them). And for the second charge which took 5 hours to get to 100% last night but I unplugged it this morning (10:00am), I get a 55% now (5:35pm) with a moderate usage (emails, web browsing, Youtube video). I think it can hold to the end of the day. Streaming the 20-min video only cost about 8-9%. Other consumption comes from randomly using apps and testing maps, etc.
Although the heat is not likely to be from the battery, heat is always transformed from discharging. A cooler device will always have a lower power consumption. I would expect a boost of battery life when more and more WP8-optimized apps, including new versions of Nokia apps.
Other apps will also warm up Lumia 920 a little bit but not as quickly as those Nokia apps. The temperature will not be as high as with the Nokia apps.
And the heat problem becomes severe during charging.
I initially thought the heat was coming from the battery discharge. But after checking the photos of dissembling Lumia 920, I find the heat focus at the processor (top half of the phone), not the battery. Another point that may worth to make is that the heat doesn't seem to be from Wifi transmission because: 1. I got the heat problem even playing with downloaded maps in Nokia Map. 2. I tried watching Youtube video for about 20 minutes and the heat is much less than playing Nokia Maps for 2 minutes.
I guess the reason would be the lack of code optimization for those Nokia apps (probably other Mango apps too). We know that most of those apps have versions that can be run on Mango or even on Symbian. It is possible that they just did a quick porting to WP8 in a limited time without fine optimization. Maybe a release/update version can do a better job.
Now about the battery life, for the first charge, I got a 2-day-1-night duration with light usage (check emails occasionally, 1-2 phone calls, installed about 5 light apps (like Bank of America) and tried them). And for the second charge which took 5 hours to get to 100% last night but I unplugged it this morning (10:00am), I get a 55% now (5:35pm) with a moderate usage (emails, web browsing, Youtube video). I think it can hold to the end of the day. Streaming the 20-min video only cost about 8-9%. Other consumption comes from randomly using apps and testing maps, etc.
Although the heat is not likely to be from the battery, heat is always transformed from discharging. A cooler device will always have a lower power consumption. I would expect a boost of battery life when more and more WP8-optimized apps, including new versions of Nokia apps.