Magnet "rechargers" are just very strong magnets themselves that are used to re-polarize the magnets. They work well on some magnets, and not real well on others. The cheapest ones use permanent magnets, and run between 50 and 100 dollars. The BEST ones are electromagnets and run over 150 dollars, I believe (it's been a while since I've ordered one). Not worth it for a .46 Magnet!!