That looks like the V2 but don’t think there is any battery indication on the 3 lamp display or in the APP. I’ve read where some have tried to connect V1 sensors to these with varied to poor results. 
I honestly don’t know much about the support - I bought my first camera yesterday. But the couple of bugs I’ve already encountered, along with the huge number of posts in this community are not promising. I’m likely to return my camera and spend a little more on something a little better. This seems to be a case of “you get what you pay for”.
Might be a good idea. I also had issues with my WiFi Camera, two way audio was not working well, and as today no response. That was more than a month ago.
There is a Battery Backup in the Hub, must be a rechargeable battery. As you indicated, I have not found out where it reports the battery status. Might have to be on Battery in order to see the status.
Also, I have V1 Sensors connected to it. For me, they are working great and can now work further than the old bridge would allow. The only issue I can see with the V1 Sensor is that occasionally it will indicate the battery is low in the V1 Sensor, and then visual notification goes away. This has been reported.
The one time I actually needed support, they were incredibly helpful but that was a while back when it was just cameras and the contact and motion sensors. I don’t know about now with all the variety of product that they have released. I’m having issues with their headphones right now. I think the main difference with support for me is that I called in vs. submitting a ticket. So, if I do need support that will be my route next time as well. I’m waiting for 1 more software update before I call for support on these headphones because I’m fairly certain the issue is SW based.