Yesterday I flashed [ROM][5.0.2][AOSP][LRX22G] || Pure Shamu b3.97 || [1/18/2015] and unencrypted my N6. I also installed Franco Kernel. The battery life is AMAZING. Of course that's only on a limited time to review it, but let me say that normally by this time of day I am at about 80%-82% battery left. I'm 10% greater as of now.
Nice.
I am running CM12 and activated the LED using the hack.
I thought about removing the encryption, but I did not want to wipe my device again.
Maybe I'll do it if it's wiped in the future.
Battery with CM12 is rather good though.