I've been doing quite some testing these few days with LTE, Mobile Internet and Signal Quality in relation to Battery Life and I've found out something interesting about the iPhone and iOS 8.
What I've come out with is a procedure that will allow you to double the battery life on standby on your iPhone with normal usage.
From the title picture, you can see that the iPhone has been in use for 1.5 days and still has 61% battery left. This also includes more than 2 hours of talk time, regular and VoIP.
Here is a video tutorial with the step-by-step procedure on how to achieve this:
If you have any questions or need any help with the procedure, please feel free to contact me.