The Samsung Fast Charger 9W can be used for the Samsung Galaxy Watch 7 44mm as it is suitable as a wireless charger for Samsung smartwatches. However, there are specific chargers that have been developed especially for the Galaxy Watch 7, such as the Galaxy Smart Watch Wireless Charger, which offers a fast charging function. However, the Fast Charger 9W should generally be compatible as it offers the necessary power for fast charging.