[header] How to make a magnetic induction battery charger [title] Get some rechargeable batteries. [step] Non rechargeable batteries will explode if charged. [title] Go to an electronics hobby store and buy the following items : [substeps] 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. 
[title] Now you will need to acquire these mechanical parts. [substeps] A hand crank something to mount the hand crank to, but make sure it can still rotate.