I go into battery usage in ios 8 on my 4s and I see the time since last full charge info (usage/standby) but not seeing any specific app info. I keep getting the waiting spinning wheel indicator for a few seconds when i check, then it says battery information will be available after using iphone for a few minutes. been about 15 hours since i installed ios8 at night, my phone was on charger all night, then used a bit, then charged back up, now 73%. does my phone need to run down a few times before it shows me this? does it need a day or two of usage before i can see this? or is this something wrong on my end?