Hey Bubby,
"Batch 2" is just a way to distinguish our newest device from the original "Founder's Edition", and was an overhaul of the ground up on the hardware and software side.
As we don't sell FE devices anymore we just have Batch 2, so we usually don't use that lingo anymore 🙂
We offer a 1y warranty on manufacturing defects only, more here in our FAQs: