Keep in mind that this is my first instructable, so please be gentle. And please hit the little + thingie up there.
Step 1: Materials and Tools
You need a pen to mark the measured points on your cardboard and aluminum foil. A ruler is needed to accurately make the holders otherwise you're going to have one wonky battery holder. You need an exacto knife or scissors. An exacto is more exact ;) but scissors work wonders cutting the tape straight. The golf tee is for scoring the aluminum it isn't neccesary.