So............after a few days to settle down and sort it's sh*t out, Beta 2 is running like a dream on my 16PM. No bugs, hang-ups, re-springs, glitches etc etc. Battery life is bonkers. Ok, so I'm a light-ish user, but I charged my phone to 100% yesterday at 10:46, I've since listened to music on a 2 our walk, an hour or two on YouTube and various SM, local news, Find My etc, and today I went on a 20 mile bike ride whilst listening to music.
I have many on-screen notifications going all the time. My camera has also been snapping away. Anyway, after all that, I still have 79% battery with 3 hours 50 mins SOT.
This is the best my 16PM baddery has been.