Exactly the same problem here: Left to charge over night and found the phone at 95% in the morning. Re-plugged the phone, and it went back up to 100%..
Is this an issue, or are they trying to save the battery from too many cycles (would "leave it powered" count as a cycle)? In any way, they should try to proactively communicate this.
I am heavily disappointed by the battery lifetime. Two hours after unplugging it from the 100% I had, it was back down at 85% (only using bluetooth). The phone does not even last a day's (normal, not heavy) use. It compares to my 2.5y/o iphone4 or worse. Indeed, I would have prefered a 1mm thicker and 30g heavier device, which I could have used for a full day.. :-(
This may be a carry over from the macbook... where it stop charging if you connect it. It will start charging once it hits 95%.
If i recall correctly, its something about not overcharging the battery so it gives it time. if u really want 100%, unplut it, let it drop to 95% and put in to charge.
not sure if it applies but its possible...
It is charging. It is just doing what HSUEA001 described. I have researched this topic a lot and the symptoms are what happens to the Macbook. I checked the crash log and I haven't had any apps crash since I updated to the iPhone 5.
Thats what I thought as well, but it seems to happen sporadically. It also does not happen on my girlfriend's iPhone 4S. Through my research I have discovered that this is an issue since the 4S. Nobody seems to know what it is. When I went in to my Apple store for my genius appointment, he ran a diagnostic and the battery was functioning normally. This doesn't put me off the phone at all, I was just wondering what is going on.
Update: I just tried to replicate this with my 3 year old 3GS and what happens is that after some time the plug will turn into a thunderbolt (while charged and remaining on the charger), however the meter still reads 100%. My 3GS is on iOS 5.1.1. It seems that it is normal, but essentially the iPhone 5 battery meter shows the actual reading (after the whole iPad thing that charges for an extra 2 hours after it reachs 100%). So, I am going to assume it's normal behaviour, the battery meter is just showing the actual reading.