Is there an app in the Appstore that will tell you what your battery percentage is at? Mine is off and shuts down when the battery reads a random number (anywhere from 30% on up). I've gotten 3 replacements and all 4 iPhone 4S's have the same issue and we haven't been able to figure out why. My last resort is an app that I can use that will tell me what the correct percentage is. I have downloaded Battery Doctor but it just shows me what the system battery percentage icon shows which is 100% after 14 hours and 35 minutes of standby and 1 hour of usage. Any help would be appreciated.