How do I get a 3-4 volt battery to a 9 volt battery?
I have one of those hand crank flashlights, I took it apart and there is the 3-4 volts, which I need a 9 volt battery from the store?
You must first see the current issue measure to ensure that you always cranks on a 9 volt Battery, even if you built the circuit including a DC-DC converter, and you would have at least 10 volts and go because of the current physics for actually charging be about 1/3rd of what you measure from the hand crank unit
GreenandMore.com: Hand Crank Flashlight Demo — Never Use Bat
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