Q: After charging my apple watch 1 later my battery drain

Hi

If you have not yet done so, it may help to update your Apple Watch to the latest software:

• Update the software on your Apple Watch - Apple Support

Otherwise, the following steps have helped to resolve battery life issues for some users:

• Restart both your iPhone and your watch:
  • Turn both devices off together, then restart your iPhone first;
  • To turn your watch off: press and hold the side button until you see the Power Off slider; drag it to turn off;
  • To turn it on: press and hold the side button until you see the Apple logo.

• Unpair and re-pair your watch:
  • The Watch app on your iPhone takes a backup of your watch automatically when unpairing via the app. Choose to restore the watch from backup when offered the option during set up. Most data and settings will be restored, with some exceptions (eg Apple Pay cards, passcode).
  • Unpair your Apple Watch and iPhone - Apple Support
  • Set up your Apple Watch - Apple Support

For the best performance from your watch, keep both Wi-Fi and Bluetooth permanently enabled on your iPhone.

If the issue persists, I suggest that you contact Apple Support (mail-in service may be available) or make a Genius Bar reservation for further assistance, including - if necessary - with a view to having your watch checked under warranty:

Contact - Official Apple Support

https://twitter.com/applesupport