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There are a few different types of that can be purchased that you could have for the those times of emergency.

As the name suggests a works without any requirement of batteries. One can also call it as the forever .

A that uses the Faraday Principle has copper coils that are passed through a magnetic field when you shake the . The resulting electricity is harnessed in order to the .

My present invention relates to and more particularly to which are operated by spring motors. In my present invention, I have designed a having an intermittent main drive.

https://en.wikipedia.org/wiki/Batteryless_radio

https://en.wikipedia.org/wiki/Batteryless_switch

https://en.wikipedia.org/wiki/Battery_leasing

Amazon.com: batteryless flashlight

Batteryless Flashlights, Batteryless Flashlights Suppliers …