Charge your watch using your phone!
Wireless Powershare for charging your Galaxy watch 4 using your mobile phone is available only when you pair with a supported Samsung Galaxy phone.
When you wirelessly charge your watch, some features are not available while sharing power.
Your phone must have at least a 30% charge available to share its power with your watch.
Remove any thick cases from your phone and watch. Wireless PowerShare may not work through wide cases.
- Open your phone’s Quick Settings and tap the Wireless PowerShare icon. If you don’t see it, choose the More button (the three vertical dots,) tap Edit, and see if it’s hidden.
- Place your Samsung phone face down, then put the watch on the back of the phone to charge.
- You’ll hear or feel a notification sound or vibration when the devices connect and charging starts.
- During charging, do not move or use either your phone or your watch.
Source : myhealthyapple.com