I recently purchased the Wyze Doorbell Duo to replace my Ring Doorbell and after installation I noticed that the battery wasn’t charging but my Ring wasn’t having issues. I assumed it was a defective product so I exchanged it through Amazon for another one. The replacement is also not charging either. The battery itself will charge by USB cable. Wyze Support basically said to get a refund but that’s not what I want to do. I read on this forum the other day that some smart doorbells need a bit more power and the best success came from a 16v 30VA doorbell transformer. I swapped the transformer out today and it’s still not charging. I tried resetting the camera, resetting the breaker, taking the battery back out again and no resolution. Does anyone else have any suggestions or am I just inevitably going to have to stick with my Ring?
Welcome to the Forum, @chris.m.park! 
What detail can you share about the kind of chime you’re using and anything else you’ve installed in the system (e.g., any diodes, Wyze Chime Controller, a jumper wire, etc.)? Also, what AC voltage are you measuring at the doorbell button wiring and at the transformer when you test those locations?