Lte and the display are the top battery consumers. The longer lte is on, the more horrible your battery life will be. That's a downside to metros "amazing" lte network. I suggest a battery saving app that cuts the radio off when the screen is off. No need in having it on if your not using the phone right? Try juice defender.
Next. Keep your screen brightness to no more than 40%.
If your using Facebook, get rid of that ram hogging disaster of an app and use friendcaster. 10x better than Facebook's html garbage.
Live wallpapers and widgets are also going to consume battery. Ask yourself if you need them.
Get on eBay and buy you a 1700 or 1800 mah battery. That's the biggest you can run while keeping the stock cover.
And the biggest of all, switch to the #2 Rom.
Hope this all helps.