- Charge the Watch, turn on, until 100%
- Turn off the Watch on the charger and then unplug it
- Turn on the Watch and wait for a "full turn on" (all widget ready)
- Replug the watch and wait for a full charge, in fact when it's 100% and no lightning in the battery logo.
I tried this for a week, before that my watch last ten hours without wifi and automatic brightness and now 15 hours with wifi and automatic brightness.
I hope it will help you