Lollipop AOSP Battery Life

I've had 0,3-0,5% battery drain per hour (in standby) on stock 4.3 Jelly Bean. After update to KitKat, my battery started to drain faster and it was somewhere around 1,0-1,5%/h so I downgraded back to the Jelly Bean and all was normal again. Now, I updated to 5.1.1 AOSP Lollipop and even with everything off and all battery friendly settings, I'm experiencing exactly the same issue: 1,0-1,5% battery drain/h. I've made a new record with 14,5 days of battery life with light use (on 4.3) and now it's not possible to go over 4-5 days in IDLE ! I've made a factory reset/wiped everything. How is it possible that Lollipop causes me this battery drain when Jelly Bean didn't do it ?
I monitored my battery with wakelock detectors for 3 days but there is no wakelocks and device is (as apps said) in deepsleep most of the time.
Any suggestions ? I like new system but with this terrible battery life it's really annoying.