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In this short instructable we will create a battery holder which also acts as a switch. It is portable, lightweight and uses no special techniques to create. The design is generic i.e. you may use any size syringe and combination of cells to create you battery. Say you want to have 12V then just tape together 8 x 1.5V button cells and fit them inside the syringe.

Step 1: Materials Required

The cell with the voltage you need.
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

Remove the plunger from the syringe. If the rubber seal has a coned shape, cut it straight before gluing the nut onto it.

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.
Really simple but great idea
<p>What a great idea. Some things are just too obvious. lol</p>
<p>This is so simple and so awesome! Brilliant!</p>
<p>having a why i didnt think of this moment</p>
Brillant! It is SO simple. Why didn't I think of this?
Really simple but ingenious idea! <br /> Nice! and useful just when I needed it !
Nice! useful when needed !<br />
A strange but ingenious idea!<br /> <br /> In some syringes, if you pop the rubber seal off the plunger&nbsp;entirely, the right size nut might just screw right on&nbsp;to&nbsp;the mounting &quot;stud&quot; left behind...

About This Instructable

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Bio: I have my own lab where I teach Science & Mathematics to children of all ages. When not teaching, I "tinker" with whatever I can lay ... More »
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