Samsung Electronics GmbH
Hello,
we recommend the use of the Fast Wireless Charger EP-OL300BBEGWW.
Best regards from Schwalbach,
Your Samsung Service Team

Yes, it is wireless QI compatible, and with the cable it charges 2 times faster.

Should work as both devices support the QI protocol. Charging might take a little longer than with the charging station. No warranty, bought powerbank as a gift and don't have a Galaxy Watch.