Q: My watch battery life has recently dropped to only 4-5 hours. Fix?

Hi

Try restarting (or, if that doesn't work, force restarting) your Apple Watch:

• Restart: Press and hold the side button until you see the Power Off slider; Drag the slider to turn off completely; Afterwards, press and hold the side button until you see the Apple logo.
• Force restart: press and hold both the side button and Digital Crown for at least 10 seconds, until you see the Apple logo.

Restart your Apple Watch - Apple Support

Also do the same with your iPhone:

Restart your iPhone, iPad, or iPod touch - Apple Support

iPhone OS 3.0.1

That can't be right. What iOS version is your iPhone running?

I had the same problem. Took my watch in and it turned out to be the force touch wasn't working properly. It was in a constant mode of being made to work. They took the watch and sent it in. I'm hoping to get it back by the end of the week.