Step 1: Materials Required
A suitable syringe (discarded or brand new, big enough in diameter to fit the battery you need to use or have constructed.
Electrical wire (Thin enough to fit two strands through the front opening of the syringe).
2 x nuts to fit into the syringe. These will be used as contacts.
Glue gun, scissors, wire stripper.
Step 2: Assemble & Done
Tie the two nuts to strands of wire with the ends stripped. Insert both wires through the front opening of the syringe, add a battery in between.
Glue (with your glue-gun) one of the nuts with wire attached to the plunger section of the syringe. Add a battery between the nuts, replace the plunger and voila! you have a switch/battery holder combination to tape or tie to any project.
The images supplied are self-explanatory. The switch/holder featured here uses a 1.5V AAA and powers a small vibrating robot bug. As most parts are to be found around the house (i.e. the thin wire from an old ribbon cable), this switch/holder should be easy to build for anyone.