Watch this science video tutorial from Nurd Rage on how to get zinc, carbon rods and MnO2 from lantern batteries. They show you how to get zinc, carbon electrodes and manganese dioxide from a lantern battery.
Zinc is a good metal for battery experiments.
Carbon electrodes are good for electrolysis.
Manganese dioxide will be used for "elephant toothpaste" experiments and similar hydrogen peroxide experiments.
Brought to you by one of WonderHowTo's favorite scientists NurdRage.