This is the new 2022 model, now has non user-replaceable battery but is supposed to last 3 years with normal use - I have been wanting to buy some pros but they have been out of stock everywhere for a while now (at a decent price) so may pull the trigger.
The battery is a CR2032, welded to strips which are soldered to the board. You can pop the case open with a small screwdriver, break the welds and replace the battery then re-seal, but you are relying on pressure alone to maintain contact to the battery - you can buy 2032's online with the contact strips pre-welded and then solder them in, but I have not seen any with the right configuration of welded strips to match the PCB.
I have the pro of these and its been great. With Amazon Prime day tomorrow, it might be worth holding out?