I wished I could report similar progress, but I have only gotten five days out of 4.4.4 in my primary FP1 once – using the battery charged in my secondary FP1. Now that I charged the battery in the primary FP1 again for the first time, it’s already back to the 1% per hour hemorrhaging (without any use other than an active SIM card) 
I had already done two battery resets in the course of my efforts to get it to normal discharging rates, I really don’t want to stress the battery that way so soon again.
Having ruled out all sorts of individual apps as the culprit, I was temporarily thinking it was about the SD card. But the externally (in my secondary FP1) charged battery then suggested it’s not the SD card.
I have tried so many things to change this pattern and without any usable conclusion, I’m about to give up and go back to Macadamia or even Kola Nut. Battery lifetime and listening to music from a large SD card is more important to me in my FP1 than the ability to go online.