Hey everyone. Coming from my s2 i9100, I think the battery life on my N4 is awesome. Only using it a couple days and I've been on it a ton. Screen brightness 100%, wifi and BT on all the time, and lots of use. I ended the day yesterday at 25%, and I must have had at least 3hrs screen on time.
Brings me to my question, how do I find out my screen on time. Do I need a 3rd party app, or is it hidden somewhere in the settings, because it isn't under the battery tab. I'd love to see what my screen on time is. This morning I took it off at 8am, it's 10pm (almost) and I'm at 47% with 13h 32m. Damn good compared to my old s2, this thing is awesome for battery life, and it's an amazing phone. I've had a lot of phones (about 180 over the years) and the Nexus 4 is incredible. The fact that I paid $394 CAD brand new is kind of silly
I am coming from a S2 as well and my battery performance has been worse though I'm trying to figure out why.
A few days ago, I left to go to a friends place with a fully charged Nexus 4 and in 20 minutes, it had dropped 25%. Battery stats showed Google Maps had used up 65% of that 25% and I didn't have it running so I went into the settings for Google Maps an unchecked everything.
Then while checking out a restaurant menu on PDF and making a single phone call, my battery dropped another 20% in 10 minutes... Battery stats was showing Adobe Reader as a draw so I guess I have to find another PDF reader.
I turned off the phone at that point because I was at 50% and it was only about an hour since I left home! Later when I tried it again, battery life was dropping fast and it showed Dolphin was the culprit and it wasn't running (but a mobi.tunnelbrowser or something thing was running full tilt).
At this point my phone was at 13%. Then the funny thing was is that the battery didn't drop after that despite using it. Surfed the web, checked some videos to force it to run down and it wouldn't. Kept on saying 13% even if I rebooted. Finally let a HD YouTube video run since I wanted to run the battery down to empty to see if I could reset the battery stats.
Now all this being said, when I use the phone around the house, battery life seems pretty good but as soon as I take it out, it drops fast. Granted there were other causes but at least for me, I think being mobile with the phone causes faster drain which means it must be a cellular issue and GPS issue. I've disabled the GPS stuff and the drain still happens so I still think there is a cellular issue (I also have reception issues with this phone so I think it is constantly trying to get a better signal causing it drop).
Not to mention the heat coming from the phone as when I first noticed that huge drop, the phone was really hot.
So, at the end of the day I am not too impressed with the battery life so far, especially since you can't change batteries. On the plus side, it charges a lot faster than the S2 which took forever. And it can take a lot of detective work to figure out the cause. Maybe the 'power saving mode' on the S2 did a lot of the stuff we have to do manually on the Nexus 4. I wish that was more an Android standard feature...
Hopefully I can find some more fixes.