After updating to iOS 8 on my 5s my battery life has been cut in half.

After updating to iOS 8 on my 5s my battery life has been cut in half.  I turned off Bluetooth, location services.  It drains it even when not in use.  I am an RN who works 12 hour shifts and I had to charge my phone twice with little use.

The Ultimate Guide to Solving IOS Battery Drain
http://www.overthought.org/blog/2014/the-ultimate-guide-to-solving-ios-battery-d rain

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    Internal damage from fall or loose connector. Take it to
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