Magnetic charging leads?

Anyone still making / selling magnetic charging leads?

Sorry I don't know about any. But realistically they should be quite easy making one suited to you application quite easily.

The hard part is that you can't solder onto the neodym magnets - at least not without damaging them. A bit of fantasy is needed to glue the battery and something iron which you've soldered a wire to. Glue on the outside as you do not want glue in the actual connection. Or you can just make a good assembly to the iron piece or a bass piece (nicely soldered with shrinking tube) and use two magnets.
Bottomline - it shouldn't be hard to make one yourself

But It'll not work om some Li batteries in aluminum containers and a protection circuit make a distance to the container so you need a stronger magnet at that pole.

I think LuxLuthor said he solders to tiny magnets all the time with no problems.

I have a few sets of Lux's magnetic charging leads, and they are a joy to use. I believe, from the pull, they are rare earth, and they are stoutly built with primo wire.

I don't think he sells them anymore, but I'll bet he'd share the technique, if you plead with him, bow and scrape and such.:devil:

Would you mind posting a pic of your charging leads Donn as im interested in doing this as well with single cells.

The leads are about 3" long. The magnets about 1/4" cube.

The Photon Rex http://www.photonlight.com/Photon-ReX-Keychain-LED-Flashlights-p/rex-lithium-ion-rechargeable.htmComes with magnetic charge leads.

Thanks for the pic.......it was worth posting it, plan on making a couple of my own for charging single cells.

The problem with soldering to magnets is that heat destroys the magnetism. The soldering therefore has to be done very quickly, so that the whole magnet doesn't have time to heat up.

DM51, thanks for the tip.......did'nt know that at all.......

Yep - it's the Curie temperature. NiB magnets have a Curie temperature of, I think, something like 350°C, so it's possible to solder to them without killing the magnetism if you're quick enough. It helps to have a temperature-controlled soldering station and acid-core solder.

donn_ said:

The leads are about 3" long. The magnets about 1/4" cube.

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DM51 said:

The problem with soldering to magnets is that heat destroys the magnetism. The soldering therefore has to be done very quickly, so that the whole magnet doesn't have time to heat up.

Click to expand...

well, for what I have worked with, if you can make a magnet lose its magnetism using a 25W iron I dare say you have very special soldering skills. :hahaha: :tinfoil:
I soldered my wires on 3/16" 24K gold plated NdFeB cubes and apparently they are immune to my solder gun as I tried to sacrifice one to see if you are correct.

Besides, even if it loses its properties it still provides a standing platform to connect an unsoldered magnet to:nana:

I made my own a few weeks ago using DX's rare earth magnets. Very easy to make. Takes 5 minutes and 20 cents in magnets / wire.

The easiest way is to just solder a couple alligator clips to the wire and use them to hold the magnets.

Cool ideas for a common dilemma... lovecpf

It's not hard to do once you get the hang of it. I can still make them and packs.

Lux Luthor's charging leads are terrific! If he'll make you some I'd buy a set or two off him.

Here is one of at least two different ways to have good magnetic contacts:

You need a magnet (this one has 16mm diameter) and a contact (in this case 6mm made of silver, as I prefer silver for best contacts):



You solder them as shown (the magnet is loose over the lead):



And so it looks ready to use, held by a clamp for the photo only:



The contact must protude the surface of the magnet only a tiny bit. Even on PCBs there is a good connection.

Wulf

thezman said:

The easiest way is to just solder a couple alligator clips to the wire and use them to hold the magnets.

Click to expand...

The teeth on alligator clips can't be very good when low resistance is needed :thinking:

Fallingwater said:

The teeth on alligator clips can't be very good when low resistance is needed :thinking:

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Generally, contact area achieved microscopically is a function of force, not geometry. So it shouldn't be a problem.