How to Charge the Apple Watch and Check Its Battery Level:
The are instructions on how to charge the Apple Watch and check its battery level.
The Apple Watch comes with a Magnetic Charging Cable or Magnetic Charging Case. To use the magnetic charging cable, plug the cable into a 5W USB power adapter and then place the Apple Watch onto the concave side of the charger.
The magnets on the charger align the Apple Watch properly, and you’ll hear a chime and see the charging symbol on the watch face. The symbol is red when Apple Watch needs power and turns green when the Apple Watch is charging.