I have a 5s and a 4s. After doing a restore as new to 7.1.2 on both devices with the same setup the battery life is dramatically different. This led me to believe that there was something going on down at the code level. When using a app to monitor CPU processes and usage the 4s always has the higher CPU usage. I really think Apple leaves in small bugs on older devices. I have even turned of all kinds of thing on the 4s kinda dumbed it down and it still can't match the 5S. Is anyone else surprised at how much their 4s struggles in this area compared to their 5s? Thanks.