I run the older version of the Gorilla Chassis (7cells across).
If I role the car, the batteries fall out, when I put them in before I run the car they are very secure but get lose so easily and let go of my batteries. Did the same thing with the stock chassis and caused one battery to fall out and snap in half!
Picture:
http://www.msuk-forum.co.uk/index.ph...cmd=si&img=354
The battery wasn't heatshrinked but it had alot of glue and good solderd joints.
I snapped both the Straps around where they are screwed down and the rip goes a few CMs up the strap.
I guess they just can't secure hump-packs. Maybe I'm using them wrong?