charge with magnets and wire?

[aussiebuddha]

I'm looking to charge individual cells with the wire and magnet method.
anyone knows what magnets can i get that i can solder some wires to my charger? are the DX kai magnets any good for this? ta.

 

[legtu]

magnetism and heat don't mix well... trying to solder a wire to a magnet will cause it to demagnitize.

what i do is solder the wire to a nickel strip where a magnet to grab on to. slight problem with this setup is that the resistance between the wire-magnet-batt terminals can be a bit high.

 

[LuxLuthor]

I make these easily.

 

[DM51]

I have some like LuxLuthor's above, which I got from Mad Maxabeam, but he isn't making them any more. They are a perfect good solution for unusual size cells, NiMH packs etc., and save you having to get a different cradle or clamp, or mod a charger to take longer cells. With modern neodymium super-powerful magnets, they make a good contact.

I recommend them, and LL has the right welder to make them properly - welded solid before the magnets have a chance of overheating.

 

[LuxLuthor]

I actually have a technique of soldering wires to them like MadMaxabeam's nephew did without losing the magnetism.

 

[Illum]

magnetics and heat don't work well together...but that doesn't mean the cooled metal can't be magnetized again by another [more powerful] magnet

 

[LuxLuthor]

There are some tricks to securely solder wires to these magnets with no loss of magnetic force, as those who have gotten them from me can attest to. I added selling them to my Custom Battery Packs thread.

 

[DM51]

Dat de wrong link, Lux, it goes to the ROP master thread.

You mean this one.

(Poor ol' Lux - can't even find his own thread, lol)

 

[Norm]

Simple method solder an alligator clip to your wire or even a small square of tin plate, now the magnet will stick to the battery and to the wire. I use alligator clips.
Norm

 

[legtu]

just to elaborate on my earlier post...

my mistake on using the word 'demagnetize' since the act of trying to solder to a magnet won't actually remove its magnetic properties.

yes, you can solder to a magnet but it can loose some or all of its magnetic properties the longer it remains heated and/or if it gets too hot.

the small, round rare-earth dx magnets are quite powerful and are ok for these application but their effectivity would depend on your soldering skills and technique.

 

[Fallingwater]

I usually just clamp the wires on the magnets, or inbetween magnet and cell. However, the coating on the magnets lends itself well to welding. I welded a small nickel strip to one (at least I presume it was nickel... I ripped it off an old dead laptop cell), and had no trouble soldering a wire to the strip.

You do need a welder though...

You could just wrap the wire around the magnet a good few times and let friction and magnetic force do the rest, but it's no good for permanent connections.

 

[LuxLuthor]

Dat de wrong link, Lux, it goes to the ROP master thread.

You mean this one.

(Poor ol' Lux - can't even find his own thread, lol)

LOL! I fixed it. Had too many tab windows open for my own good. Again, my leads are soldered to the magnets, and they are powerful.

 

[aussiebuddha]

thanks guys, i bought some dx ones and will try to solder.