Just thought I'd share how impressed I am with the battery life of my 945 APAC. I had a really long mtb ride yesterday and required my garmin to record all day. After making just 2 setting changes (smart recording instead of per sec + turned off phone connection), the watch easily survived 12.5 hrs of recording. And still had 60% battery life left!! I'm not sure if this was due to the 4.50 update, but I had seen some battery life improvements prior to my ride.
I do leave Pulse Ox off as this used to cause a big drain and I'm not fussed about it anyway. Maybe I could turn it on now. Anyway, very pleased with this update!