Over time, magnets that have been dropped, hit repeatedly or stored incorrectly can lose their pull. Using a neodymium, or rare-earth magnet, you can easily recharge these worn-out magnets and use them again and again.
Locate a neodymium magnet. These are magnets made of neodymium, iron and boron. They can be bought in science supply shops or online.
Identify your old magnet's poles. All magnets have a north and south pole. Contrary to popular belief, these poles are usually located on the long, flat sides of the magnet, not on either end.
Determine the neodymium magnet's poles. Occasionally they will be marked. If not, find a compass. The side the needle points to will be the south pole of the magnet, because opposites attract.
Rub one pole of your neodymium magnet against the opposite pole of your old magnet. The sides that attract each other are the ones that can recharge each other. Repeat with the other side.
Keep strong and remagnetized magnets away from your computer, credit cards, VHS tapes and cassettes.