An LED Throwie is a fun.it will stay lit for about one week, but they are easy to make so you should never run out!

things you will need:

LED's in any colour. They cost anywhere from 3p-15p each. Red, yellow and green are cheapest. Standard 5mm size is best.

Duct-tape,or movers tape

Button batteries like found in calculators, 3V Lithium.

Step 1: Know Your Battery

your lithium battery has a positive side and a negative side. The negative side has less surface area than the positive side. The positive side is larger and has a (+) symbol and includes the side of the battery.

Step 2: Examine Your LED.

It probably looks like a tiny plastic bullet with two legs or leads. One lead is longer and possibly darker, this is the anode and needs to touch the positive side of the battery only. The other lead is shorter and possibly lighter, this is the cathode lead and needs to touch the negative side of the battery only( dont inverse these two).You can find out what color of LED by correctly attaching it to your battery, the battery. An LED is a light emitting diode, not a light bulb. The color is not determined by the plastic bullet shape, but by the semiconductor material inside the LED.

Step 3: Tape the LED to the Battery.

Cut a 1" x 7" piece of tape. Holding one wire from the LED to each side of the flat battery, wrap the tape around the outside of the wires and battery. Wrap it one time around, neat and tight. The LED should come on. If it flickers, you did it wrong. Do over. You should have a portion of the tape strap hanging off to one side.

Step 4: Tips

Batteries will likely last longer on green, blue or white LED's, than red, yellow, or orange LED's.
You can make Throwies that stick to all kinds of objects by wrapping them with double-stick tape.