craig
2
I have personally used a variety of wall charges with the THETA V for years. Make sure you try a few different cables if you have a charging problem.
I usually use a 2amp charger, though, I think that anything over 1amp will work. As the 2amp chargers are around USD $8, seems like a reasonable buy.
Additional info on charging a THETA V, including a link to a cheap device that can monitor the charging current into the camera.