Why is my watch battery draining so quickly with Watch OS7?
My watch used to last 36 hours or so without a charge. Now it's lasting maybe 8. I unpaired and re-paired but it did not help.
Apple Watch
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If the battery drains too fast after an update, see the replies to:
Update 6.2.1 Battery Draining Too Quickly… - Apple Community
(especially the reply by connorfromgrinnell) and:
To understand Apple Watch performance and its relation to your battery, see:
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