I'm just going off of what I think. I think that a lipo that wants to puff a little bit may not show it visually as much. But once it gets to a certain level, the puff WILL go somewhere. I'm sure it will warp the metal as well as puff out along the sides not protected by the medal.
In my opinion, these are just a gimmick. I don't know anybody that stabs their battery packs. Even if you did you'd only be protected half the time considering it only covers roughly half the surface area of the pack.
I almost always carry my batteries in an old Ammo box when not in use. I keep care of my batteries and would never consider getting any form of additional protection for them.
I think they made it with the metal because in a bad crash some plastic or debris might puncture the battery and cause it to explode but with the metal theirs a less chance that it will puncture it.Just my thoughts but i think it may cause it to over heat instead of cool it.
Landing is just a controlled crash:yes:.