It is so frustrating to reset every time when there is a update.
I did not reset at first, just updated and checked for a day with my normal day to day usage.
It had improved considerably, after this I just wanted to start from scratch, so I wiped everything.
Maybe you can try downloading the firmware using Frija if you have got no update.
UPDATE: It's been over a day since I charged the phone, still have 49% left.
Mostly phone call usage and youtube, otherwise the phone is just idling.