Home > Life, The Universe, & Everything > Batteryless Flashlight: A Must In Your Car During Winter

Batteryless Flashlight: A Must In Your Car During Winter


Every time I reach into my car’s glove box and look for something my hand brushes my trusty flashlight. This flashlight is so trusty because it operates without batteries. I know I can always rely on it for this very reason which makes it the perfect thing for me, and indeed anyone, to have in their car. It is all the more important to have in your car in a place like Canada where our winters mean 14 hours of darkness every night and it gets very cold. A flashlight that you can leave in your car could be oh so important to signal a passerby on a dark road if you get stuck somewhere at night.

“How does it work without any batteries?” you ask. Well, as the name ‘Shaker’ implies it requires you to vigorously shake it and it uses a linear generator which is a sliding ‘rare earth magnet’ moves back and forth through a a spool of copper wire as you shake it. A current is induced in the loops of wire by a process known as Faraday’s law of induction each time the magnet slides through them. This current is used to charge
an ultra-capacitor which takes the place of the battery. The ultra-capacitor is used instead of a standard rechargeable battery because it doesn’t wear out like a battery making it ideal for long term storage. Because the flashlight uses an LED the light also requires a lot less electricity to work than a standard light bulb. Of course it isn’t perfect as one minute’s worth of shaking only generates a couple minutes of usable light but when it’s dark and you have nothing else for light you’ll be thankful you made the investment to keep one of these guys around.

I know for certain that this is all true because I have had this flashlight in my car for years and years and barely have ever had any use for it, thankfully. More often than not someone will come across it when looking for tissues or something in my glove box, try it out, tell me it’s broken or out of batteries and I’ll have to explain to them by example how it works. That’s actually how I ended up thinking about it to write this post today.

Do you have something like this in your car or house in case of a power outage or something of the like? What do you keep in your car – just in case – for the winter time?

  1. January 12, 2012 at 8:36 pm

    That’s an amazing invention, it helps so much, especially if you don’t have battery.

    • January 14, 2012 at 1:42 am

      Well ya, that’s kind of the point “Used Cars Toronto” with this flashlight you don’t need a battery! The idea is to keep it in your car for emergencies and this makes it one less thing to think about ensuring is in your car.

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