Just refreshed to PRISM BAREBONE 5.0.1, it is a lovely fireware. Lightweight and nearly kosong (500MB+- and you dont have S Health, Calendar, Music Player and a few more SamsungBloat apps)

Initial impression is it is smooth and fast. Battery take a massive hit on the first day of upgrading but now had stabilize. Minor improvement from 4.4.2 Ozcan which i was running. I miss Ultra Power Saving Mode on my S4.

It is the very best OS from Android so far.

May need to check the Google Play Service settings and do some changes, it may drain battery.

Did u refresh to new phone ? Or is there tons of picture in your Gallery ? I didnt see this problem with a mate's Note 4 when i test power with it.