Actually, it will be much more difficult.... and it will take a sacrificial unit or two to learn how to do it. And even after that there will be some that are ruined by mistake and bad luck when trying to fit a new battery.
The new sensors are potted, meaning they are filled with liquid epoxy at the end of manufacture. That means that in order to change the battery we will need to know 1) where (exactly!) the battery is inside the unit. 2) which way the battery leads come to the battery. Then to change it, someone will have to dig out the epoxy, remove the battery without destroying the battery leads, then solder new wires to the very short ends of the wires poking out (Easy Boys!) of the epoxy block. Difficult to say the least and a high failure rate when doing this....
Brian
Since they changed the unit, I hope they made it easier to change the battery.