I notice battery drain during night. From 52% till 26%. I did a reset after the latest update.
Aod off, lowest brightness setting, pulse ox off
It looks like the same drain as with the 255/955 when they launched
Install this for a clearer view on what's happening:
Can you complete a Spotify "Update downloads" to 100% without an error? I was dropping percentages like you until I completed a sync - maybe it was trying in the background, even with wifi turned off.