IOS 8 battery problem with iphone 4s

Question

I installed IOS 8 over the weekend on my iphone 4S.  My phone is completely dead because of the battery drain to fast.   for example it was 100% fully charged, left alone for 20 min later (without using it), the power went down to 72% .  or went to bed power at 85%, the phone went dead next morning.  another occasion: left the house at 65% power,  it went dead after 2 hrs WITHOUT A SINGLE USE.  I went to the Setting so many times to see anything that unusual, I turned of: Background App Refresh,  Turned off Location Services (each App too), etc..  I done everything I can, still the battery draining too fast.   Apple what have you done, this is causing so much grief !!!!  I need help !!!!    another problem,  when I am in an App ( i.e.  CNN)  to see the news with video.   I see the video, but no VOLUME.  looks like the volume button is disabled nothing there.     

Answer 1

This sounds as if an app keeps running in the background although you don't use it or allowed it to use it in the background.
Did you already check Battery usage to see which app you didn't use much (or not at all) causes a major use in battery. See also this article and this one on iMore.
I've seen others who had background process off for e.g. Google Hangout and Skype but still had major battery usage since iOS8.
Please look also into the apps who are allowed to use 'Background refresh' and 'Push Notifications'.
I've had similar issues with another Dutch app called Scoupy after 6>iOS7 upgrade. I deleted the app and it resolved the battery drain. The app released an update (months later) which resolved the drain finally. It was however very hard in the previous versions to find out the app which caused the drain. In iOS8 that is much easier now.