I may try building a battery as a lark, Thinner elements for a higher output. I once built a carbon arc lamp and the light output was impressive. It also could cut door hinges.
It was kind of a McGiver type of experiment, scenario, you are locked in a storage room, and you have a D cell flashlight, 220 v power, pickle jars and assorted junk, take 3 jars and metal straps and turn 3 jars into resistors using salt water and metal strap material, series circuit, and I would remove the rods from two D cells and make rod holders out of tin, and you can cut metal with a carbon rod, as with a plasma cutter.
I have a hard time believing it can be practical at the price. So in a pinch I can imagine someone having to pee on their flashlight to find their way through the dark. LOL! I had an idea for a related product to the shaker flashlights. But after doing the math, I wasn't sure how they were able to make it work. They must use a very powerful magnet, which creates its own problems. So I bought one and took it apart. It only took a few minutes to figure out that this can't work! It's a bogus circuit!!! But it does use a very low power LED, and it comes with a little battery built into the electronics. After scoping it and convincing myself the charge circuit is useless, I turned it on to see how long it would last. IIRC, it lasted about two days before the battery died. And shake it all you want but it would be useless.
Your math is..."interesting" because a magnet passes back and forth through a coil of wire and creates an electrical current that is then stored in a capacitor. When the flashlight is turned on, the capacitor supplies the stored energy to the bulb much like a battery-powered light. Basically it is a Faraday system. Oh...and hydrolight....don't bother.
Yeah, I learned that about 35 years ago. Learn the difference between math and English. How much electrical power can one generate by shaking the flashlight, and at what voltage? The surge voltage doesn't even exceed the diode threshold values. Do you know what that means? Explain it to me.
I'll pass...experience dictates the avoidance of prolonged discussion with you and it has become exceedingly clear you have a problem with me.
Well I had a shake flashlight, it was ok for a novelty, not much else. The Hydralight has a booster, it uses a torroid coil, and it takes voltage and steps it down I suppose to yeild more current. I see one definite use for this type of light as a survival device at sea, at night, it does not require much light to be spotted by passing aircraft.
