How to Go Postal

Step 7 Crank it Up

Now you can attach the battery to the circuit. There are a number of ways to do this as well:

You can epoxy (conductive) the negative terminal to the negative trace on the postal label and run copper tape from the positive terminal of the battery to the positive traces. You can substitute the conductive epoxy with a loop of copper tape for a shorter term solution. You can add a dab of 5-minute epoxy to the battery to secure it in place. Conductive velcro is another method. It requires more fabrication time but allows you to change batteries in situ without destroying the traces by ripping up the conductive epoxy.

...