The systems were in the development stage before I retired.( 07 ) Optional on high end vehicles.
Batteries are not replaceable. The valve/transmitter assemblies, are metal stemmed , with replaceable core & gaskets.
Battery life in the three years the system was available as an option, had not proven to be a concern; very few failures. Training and experience of the person changing the tires is paramount, breaking the tire from the rim or working the tire off the rim , with the equipment in the wrong place can destroy the transmitter.
Any tire shop you deal with, for replacement / repair , tell them the system is working up front and that you expect the same when they finish .