I have 2 ring cameras and the doorbell. All battery powered and completely wireless. I also have the subs to allow viewing and recording at £80 per year. This is the more expensive option but gives you extended warranty and allows you to add as many devices as you want for no extra cost.
Initial cost is high compared to some but flexibility and reliability is excellent – I did have to buy some wifi extenders to get sufficient coverage.
I bought additional batteries for the cameras (you can fit 2 to each camera). Batteries seem to last between 2 and 3 months before the first one needs charging. You could leave it until both are gone which would give you 5-6 months.. Cameras are positioned so I can just reach out the window to remove and charge (overnight for full charge).
I am impressed enough that I am considering using a power line Wi-Fi extender to my garage and putting a camera down there.
Overall I’d give them 8 out of 10. The flexibility is the best thing.