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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.

3 Claims. My present invention relates to and more particularly to which are operated by spring motors.

Hydra- is a that is powered by water, rather than requiring battery power. This is inexpensive, and its versatility makes it easy to use this device at any

These work on the Faraday Principle of Electromagnetic . That principle says that when you move an electric conductor (in the case of models, copper) through a magnetic field, electric current is released.

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

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

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

How Faraday Flashlights Work – Shake Flashlights Info

Student’s flashlight works by body heat, not batteries

Battery-less LED flashlight | Electronics Forum (Circuits …

Mechanically powered flashlight – Wikipedia

Amazon.com: batteryless flashlight