Battery life is now WAY better.
iPhone 5, Telus, Toronto.
My battery was crap.
I could leave it alone for an hour and lose 20%.
Would barely get half a day without getting low and needing a charge to make it through the day.
I tried all the tips and tricks you find when searching for answers on this.
2 weeks ago, there was a carrier settings update.
I installed that, and also called Telus, spoke to someone in tech service.
Explained my battery life, told him yes I tried all the things he started suggesting.
I explained that the building I work in is a metal box with notoriously bad signal/slow data.
He pushed an update to my SIM card, I said thank you and hung up.
Not sure if it was the carrier settings update or the sim update, but my battery now rocks.
Finally get a full day out of it.
I mention this because it might be worth your while to call your carrier and ask for help.