I agree the battery life is only so good.
But I get around it by having a wireless charger at work. Anytime it's not with me, it's down on the charger. The device tops off the battery. There have even been days I leave work with 100% battery life. It's not entirely uncommon.
Might that be an option for you?
Wireless chargers come in a wide range of sizes and prices. Mine were inexpensive. I caught a flash sale or something, and got one of these for $6 bucks. It's now back up to about $25 bucks. Worth it if it can work for you.
http://www.amazon.com/gp/product/B00VNECQMM?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00
And there are many other options.
Plus, don't forget the default quick charger the phone comes with can really help top you off, too. If you're able to just plug it in for anywhere between 10-30 mins, it'll give a big boost.
And when push comes to shove, there are also power saving modes that can help get you down that last stretch if need be.
Stuff you all probably already know, but sharing just in case.