apple watch battery dies quickly

Understand Apple Watch performance and its relation to your battery.

Apple Watch Battery and Performance - Apple Support

“Battery life” is the amount of time your device runs before it needs to be recharged. “Battery lifespan” is the amount of time your battery lasts until it needs to be replaced. Maximize both and you’ll get the most out of your Apple devices, no matter which ones you own. See the "Tips for Apple Watch" section in:

Batteries - Maximizing Performance - Apple

If the battery drains too fast after an update, see the replies to:

Update 6.2.1 Battery Draining Too Quickly… - Apple Community

I put the latest update on overnight on Wednesday, since then watch is out of battery by early evening. Before I would only occasionally get a battery issue when I’d done a lot of exercise and that would be by 10ish at night not before 7pm.