Lectrify Battery Holder

These are fantastic battery holders!  Not only do they have an on/off switch, but the holes are big for sewing with conductive thread.  No more getting the needle stuck!  And, bonus, they are designed to fit on Lego Bricks!  Run a piece of copper tape across the Lego, add a battery holder and LED and you have a circuit!  Check out Lectrify's LED and Tilt Switch too.