I'm using v2 it with 12v. 9v doesn't work if you add extra cable. It also need a good power cable, the traditional Bnc 12v cord 18m doesn't work, inner copper is to thin. So I used a bigger awg cord....

I want to connect the camera outside, so I got a cctv 18meters(bnc/power). 9v ac adapter doesn't work for 18m cord. I see the tapo c500 v1 uses 12v but version v2(which I have) comes with 9v ac...