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This is my Instructable for the LED contest.  This is also my second Instructable to so go easy on me.

In this Instructable I will show you how to make a quick and dirty LED flashlight.

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Step 1: Materials

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3v coin cell battery (I used a CR2032)
Momentary push button switch
LED (obviously)
Electrical tape (optional, not pictured)
Small length of wire

Step 2: Tools

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Soldering iron
Soldering "Helping Hands" (optional, not pictured)
Scissors (optional, not pictured)

Step 3: Soldering

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Solder the small length of wire to the positive side of the battery. (Pic 1)
Solder the other side of the wire to the switch. (Pic 2)
Solder the positive lead of the LED to the other lead of the switch. (Pic 3)
Solder the negative lead of the LED to the negative side of the battery (Pic 4)

Step 4: Wrap it Up

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Wrap the battery in electrical tape (or heat shrink tubing but i didn't have any).
Next wrap the switch in electrical tape (this part is optional)

Step 5: Finished

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Now you're done mine doesn't light much, but depending on you LED it might light up more.
doflagie4 years ago
Try conductive glue...
mdchumley4 years ago
you could use a battery holder. Sometimes circuit boards have these and you can solder to the holder contacts.
mdchumley4 years ago
Do not ever solder on a battery. These are very dangerous and will explode. I have seen an experienced electronics technician do this and got by with two or three, but the last one exploded and luckily he had on his safety glasses.
pgd5000 (author)  mdchumley4 years ago
I did not know that what do you recommend to attach the wire and led? Also is the danger only during the soldering? or is there still a risk of explosion after the light is completed?
The danger in during soldering, you are over heating the battery and placing it under high temperatures that can cause it to leak, explode, or just simply destroy the battery. If it explodes and the acid enters your eyes, you could permanently damage your vision.
pgd5000 (author)  HM-Innovations4 years ago
Thank you for the information, so how would you recommend that I attach the leads to the battery?
You can salvage the battery container for the button cell battery from another object. You can use a clothes pin to hold the cables to your battery. You can also use tape (less permanent)... lastly for this kind of project you can leave the leads unattached and then use the force of your thumb and index finger to press down on the leads to light the LED. Make the end of your cables into coils or a small ball, that way you have more surface contact if you're going to tape them to the battery. .. anything but solder :P
mdchumley4 years ago
Buy batteries with solder tabs. These are more expensive and may be harder to find, but they are made for the purpose of soldering.
pgd5000 (author)  mdchumley4 years ago
Any other ideas? I'm only 15 and I don't have a job, which means I don't have the extra money to buy those. As it is I get my coin cell battery from salvaging parts from electronics.