When I had originally sideloaded the update through ADB, I felt like battery life was slightly down from my expectations. For an hour or two it would barely suck up any battery then for 45 minutes it's like the gates opened up and my phone would lose a lot then it would slow down for a bit. As part of that sideloading I had rooted to back up some files (which disabled my Good for Enterprise app). The phone wasn't rooted anymore (apparently Lollipop is going to be harder to root, but less necessary to root?) but "thought" it had root. As a result I decided to flash the factory image (side note: thank you to anyone who has ever spent any time developing tools, applications, instructions or anything relating to Android development. I've found myself using these things on countless occasions and it makes something that sounds so difficult be so easy). After flashing the factory image I must say battery life has been noticeably better than my KitKat days. I'm at 69% (phone came off the charger around 6:00AM) and I've used the phone a bit more while re-setting up my Good for Enterprise and such. Hopefully that keeps up.
IIRC any time a major update hits the phones though, battery life usually takes a hit for a few days before improving. I remember that with even the minor updates to KitKat (and all my older phones).