I want to buy a 'Ring' Doorbell (probably Ring 2) and the Ring 'Chime' - and for initial simplicity I want to use it battery-powered. However, at a later date I might want to change it to wired power.
There's loads of information on the web, but I find a lot of it rather confusing (and even somewhat contradictory). Much of it sort-of avoids quite telling you exactly what you want to know, and the fact that there are so many different versions and models doesn't help matters.
I would have thought that an external power feed would be done by simply by removing the battery pack, and feeding it with the appropriate DC voltage. However, apparently that is not the way. Some websites say you use an 18V AC supply connected directly to the screws inside the doorbell - but the official Ring support site shows an 8 to 24VAC supply feeding it via a 25 ohm, 50W (!!!) resistor [I not it also says 'Don't use a diode' - so I guess when it says AC it really means it.]
Some sites do tell you that if you use an external power feed you have to retain the battery. This is because the doorbell does not run directly from the external power feed. Instead, it uses the battery as its power source, while the battery is trickle charged from the external feed.
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?