Hello, The first thing to always try is adjusting the brightness. If after you test that and there is still a problem, navigate to your settings and play around with usage settings such as when data is refreshed or how apps run in the background when not in use. In my experience, Lollipop is not the culprit of a poor battery. Good Luck! -John
Agreed. However, if you are still under AppleCare Warranty, I would take it to an Apple Store first to see if they would replace it for free. I always do this and if they can't help me then I turn to DIY measures. Good luck!