I used this solution to reduce the frequency of sending temperature reports, which greatly reduces battery consumption. I use temperature events for information only, I don’t control anything with them.
I have put temperature reports every 60 minutes and in 6 months they have consumed, on average, 10% of the battery.
If you are only thinking of replacing them, I would recommend looking for sensors in your region with 2 x AAA or 2 x AA or 1x CR123A batteries.