Here’s a really cool flashlight that uses 2 capacitors to power the whole thing. Best of all, the capacitors only need to be charged 3 minutes to last more than 24 hours.
Capacitors are a great way to store electricity, and of course even better when you can come up with great ideas for flashlights like this. (Also see HowStuffWorks explanation of how capacitors work.)
In this project, you will make a flashlight that works without batteries. Even more amazing, you can recharge it in three minutes and it will run for more than 24 hours. Because the ultra capacitors can be recharged thousands of times, you may save the environment from ever receiving an old flashlight in the trash system.