Electric tape on a battery?

So in airsoft, we all know Electric tape, solves alot of our problems.
I have a 8.4 mini volt battery, my gun uses a large. I have a small to large connector, which works nice, but that isn't my problem. My problem is, it makes a lot of rattling noise in the stock. I put pater towels, but it comes out bad and i lose it.
Would Electric tape on the wrapping work good?Or would it screw the battery?

Don´t completly wrap the battery,

A `` Bumper ´´ on both ends, and one in the middle for stability would work fine, what works even better is Foam Rubber.

foam rubber? sounds good.
How do i work that? Just wrap it around the battery?

You don´t want to completly cover the battery, it will get too hot and damage the cells.
The only time you want to insulate the Battery is when you are playing in a cold weather enviorment.

You can go to a local Hardware Store, or Hobby Shop and buy a `` Pipe´´ of Foam Rubber, Cut 3 Rings to fit your Battery, shave them down to fit snugly in your battery compartment, all done.