Originally Posted by kodak_jack
Show him your picture, Mike.
This is the credit card mod Jack speaks of. It's best to use a card that is flat on both sides unlike a "real" credit card with the raised print on one side. Very easy to do. All you need is an pointy Xacto blade to make the holes in the card. Take note that I snipped off the four (5 counting the backstop) pieces of plastic that help hold the battery in place. Not needed now!
It's a good idea to use "model grade" velcro. I have since gone to Marine grade velcro.
You can enlarge the photo here:
Here is my "new" config to hold the battery even better (on the right):