I honestly cannot recall. it was simply two 'regular'/easily obtained 18650s packed together in line for 8.4v topped off. it was a 3100mAh cell pack iirc
I've thought of ways to cook this up with shrinkwrap and thin metal ribbon, but it's just UGLY having a (+) and (-) so close to each other. The diameter restrictions make the 'corner' around the cells tricky, too.
Thanks for the reply. Yes, I know the 65mm refers to the length...
Unfortunately, simply adding mm to the "65" component did not help me on Google, either.