What do you call those electronic gadgets that does not need batteries? (info...

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||lPoppiexl||

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...inside)? Not the solar-powered ones, although some of those have solar panels for solar powering.
I'm talking about the ones where it has a wheel/lever. You have to spin the wheel/lever several times to charge the gadget. I have this kind of gadget for a radio and flashlight.
 
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