Gonna talk to a friend, she designs and prints arrow wraps for archery (Basically a piece of self adhesive vinyl with a design on it, used to decorate arrows) and get her to whip up a design for my eGo batts.
Here is one of the sets of arrow wraps that I use... (The black, orange and white plasma looking design)
Cool thing is that they are removable yet won't just fall off. You just need to know the length of the cylinder and the circumference...