Apple

Series 4 have been around for a while and if it's still on the original battery, the battery health is probably the issue. You may want to check the battery health of your series 4 and decide if you want to get a new battery or a newer watch.

This happened to me as well on the series 4. Prior to the last update 10.1.1, I used to get 2 days of life before needing to charge the battery. After the last update, I get 8 hours of life.

Zero issues with my Series 4, I made a post about it.

Yep.

Bought the series 4 when it came out, always get through a day with over 50% battery left.

Yesterday I was at 2% by 6pm, today was at 11% at 4:30pm.

Little late, but I just updated a few days ago and now my watch is having this issue as well. Used to last all day at work and the gym and still have 30% by the time I got home. I was at 20% with two hours left at work today, dead by the time I got off. Just ordered a series 9 for $350 on Amazon, brand new. My 4 has served me well all these years, but time to retire her.