Update 11.0 battery issue

Just updated my instinct to 11.0 yesterday (Tuesday) morning. By Tuesday night (10:30 ish) I had lost one bar of batter. This morning I went for a run (40 mins) and when I came back I had two bars of battery left. Nothing has changed in my usage in the last month or so (I only got the watch in August). 

Has this happened to anyone else? Is this just an update thing?

Any help would be appreciated.