In fact, at the time of writing, I've not had to replace the battery at all. I will advise you consider purchasing a spare from Ring though, as it can take a couple of hours to charge the battery ...
Smart ring battery life generally also makes a charging case a luxury: with battery life that can last up to a week, plugging in to charge isn't all that onerous. At the same time, though ...
Whatever your home needs, these are the best Ring ... time. In fact, in my testing, I installed the new video doorbell at 24% battery, hard-wired it, and 18 hours later, it was at 36% charge.