I have had my 6+ since November, I use it a lot for one of my jobs, On an average day I probably have about 30% remaining after 15 hours. The big thing I see is that the 6+ does last longer than previous phones I had which were 5S and 5 and 4S but I also got the 64 this time so not sure if that makes a difference and I also close out an app when I am done with it which I know many that do not even know how to do that so they keep running in the back ground. I just got the watch this past weekend and see no difference in the battery life on the phone. I have to admit that this coming November doubt I will even consider the upgrade to a 6+s because I truly love what I get from mine right now.