The answer is NO.
Since the battery of Argus PT is non-removable, it's not supported to charge the battery separately.
You can only charge the camera with the battery together.
The Cameras with a Removable Battery
Argus 2, Argus Pro, Reolink Go, Reolink Go Plus
The Cameras with an Embedded Battery
Argus Eco, Argus 2E, Argus 3, Argus 3 2K, Argus 3 Pro, Argus PT, Argus PT 2K, Reolink Go PT Plus