How do I magnetize stuff?

I want to magnetize screw bits for my screwdriver.


From what I gather I need to attach a "insulated" wire to a battery,


and wrap the wire around the metal.

What strength of battery should be used? A, AA, D?


For how long should I magnetize the metal to have it magnetized for a
good while?


How do I know if my bits contain the types of metals to keep the
magnetization (not a soft iron, whatever that means)?

You could also use a permanent magnet. By rubbing the magnet from the screwdriver handle down to the tip, (only in that direction). Repeat a few times. Every time you rub the screwdriver shaft, you increase the magnetic field "induced" (for the lack of a better word) magnetic field in the screwdriver. Mind you, it's not very permanent, and the procedure might have to be repeated in a few days time.

if you use a rare-earth neodymium magnet rubbed several times against the tips, the tools will remain magnetic much longer. You are creating a "temporary" magnet and over time or mechanical shock, it will need remagnetized. Neodymium magnets can be scavenged from disassembled harddrives. They are expensive if you buy them.