In message ,
David writes
On Monday, 23 November 2020 at 20:24:41 UTC, Ian Jackson wrote:

So can anyone confirm that I have my facts right. Am I safe to buy a
Ring Doorbell 2 and a Chime, and will later be able to add an external
power feed?

I have recently bought the "All-new Ring (2nd generation)", which is
NOT the same as the Ring 2, and an "All-new Ring Chime".

Yes, the doorbell is battery-powered. Yes, you can add an external
power feed later, which trickle-charges the battery. This is what I
have done. It works well.

Thanks for the advice (and from everybody). I would have gone for Ring 2
(because you can simply remove the battery), but they are now
unavailable from John Lewis. I think I'll get Ring 3 - and might as well
get the matching dual-band wi-fi Chime.
--
Ian