A123 9.9v triangle packs
 

Has anyone tried these? I was looking at buying a pair and running them in my CRT.5 in Parallel...

A123's are nice but too heavy I think for a crt.5 and difficult to fit on that chassis

6 cells would be way too big and heavy. 3 cells would be fine, but that config maybe be hard to place. A custom config would work, but you'd have to solder lone cells yourself.

I run a 3s 2100 pack and a 3s 2500 pack on mine on. Its does great.