Apple Watch battery draining unusually fast

Sudden drops might be caused by apps which sync data or which get stuck doing that, for example Mail or messenger services.

To rule out, that such processes are causing the drain, erase the watch and pair it again, setting it up as a new device. You will only lose your created Watch faces and may have to activate the cards in your Wallet app again.

Then check the battery life again.

Unpair and erase your Apple Watch - Apple Support

When my old Apple Watch 5 reached around 80% battery health after almost 3 years of usage, I had to charge the watch twice a day.

But Apple will only service your battery, if it is below 80%, or your battery is defective, which can be found out, if you let the official Apple Support diagnose your watch.

Apple Watch Service and Repair - Apple Support

My watch is a series 7. Since installing the latest update, my watch battery runs down very fast. It is night and day different since the update. It would last 24 or more hours a day, now it seems less than 10 hours.

Please consider following the advice in the other posts in this thread.

In addition to the other great responses, learn why ⇢ the battery in your Apple Watch drains too quickly for details.

Good luck! 👋🏼😉

Smiliñ 😎 Brian

You're welcome 🙂