Battery life is really bad on my series 1.
The Watch didn't make it to the evening yesterday, it run out of power just before leaving work. Today is no better, I'm below 50% and is not even lunch time. Of course I tried to restart the Watch, even this morning, but it doesn't change anything.
I was really tempted by series 4 when it was announced on stage, then I thought I could keep my series 1 for another year but I really think I'll make the switch. Not only battery is bad, the Watch feels slower than before. It wasn't that fast already, but know I can frequently experience stuttering animations and switching between faces is really slow (wasn't fast in watchOS 4 either)