can doorbell cam still record if you lose wired power to it, but maintain wifi?

@johnspartan you have a great question, and I had some time, so called support. Answer: your doorbell would remain powered, but only for a short period of time. The battery was designed to provide power incase of a brief power interruption. During that brief time it is active, it will record video.  The agent did not know the specific number of minutes it would last.

Take it off the wall during a live stream and see how long it lasts. If I get a chance I might try.

Taking if off the the wall may be more trouble than it is worth.  Just remove power to the doorbell system.  Mine has a transformer in the utility closet and I can de-power the doorbell by loosening one screw and removing the wire.  Or I could hit the circuit breaker which feeds it, but that would take  out some other things as well.