It's a reactor, not an RTG. One reason I don't like the term "nuclear battery". The term is also annoying here because it's clearly an attempt at spin. The cultural situation with nuclear is beyond spin, and requires direct confrontation.
The term "nuclear battery" here refers to the operational model: the modules are shipped out from a factory, hooked up on-site, run with minimal intervention, and then shipped back after several years for refurbishing and refueling. This centralizes construction and maintenance, which is important when the reactors themselves are so small.
I know. I'm arguing against this use of terminology. Nuclear batteries are things, and nuclear reactors are things. Describing your (excellent) operational model should be straightforward and should not require calling a reactor a battery. What you are really doing is demurring from confronting misunderstandings about nuclear energy.