Thought this might be of interest to some wondering about the 965's battery life.
After the London marathon I came down with the flu, so no running for a few weeks. I charged to 100% then used the watch normally, but zero activities. I have AOD on, sleep times from 11pm to 8am (default settings), default watch face but with weather, notifications set to calls only, basically everything else stock.
Got 10 days!
This pic was taken at 9.9 because I finally went out for a short run and didn't want to wait. Pretty happy overall!