Would be nice if they added some more detail about the battery like dimensions and weight, or did I miss that part.
It seems From the video they don't look much bigger than a cellphone.
That was previously announced and CES and was described as "can be any shape and any size and any voltage within a reason".
You can take a look at the announcement video https://youtu.be/Y-aPS2AwMbc?si=RD4Ja8tJggLPgXGj