Get some rechargeable batteries. Non rechargeable batteries will explode if charged.
Go to an electronics hobby store and buy the following items: Battery holder for the type you wish to charge Electrical Wiring, preferable uninsulated, but if it isn't you need to strip the insulation off. Rubber protective gloves to protect the skin from being damaged by excess electricity
Now you will need to acquire these mechanical parts. A hand crank Something to mount the hand crank to, but make sure it can still rotate. A bar magnet
Next you need to create a tube of wiring around the bar magnet. Make sure the bar magnet can rotate within the wire, but the wire is not more than 1 and inch from the magnet. Remember the magnet will be rotating horizontally, not vertically.
Connect the two free ends of the wiring to the battery holder.
Take a screw that the magnet wants to stick to and attach it to the hand crank.
Attach the magnet, using its own magnetism, to the screw. You may need two screws, one for each pole of the magnet.
Attach the crank onto the support structure so it can be cranked.
Place and secure the wire tube around the bar magnet.
Insert a battery.
Crank the handle to charge your battery.
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