Connecting batteries in series with MAGNET? Smart or Stupid?

[edrift.eu]

If i want to connect some batteries in series, like in the promovec batteries. If i have 18650 cells with flattops. Can i use a magnet too connect two batteries?

I know i CAN but i want to know if its a good idea? I've seen some video of a DIY battery pack builder use magnets to connect charger wires when charging with Imax.

I've also seen som sellers on ebay and aliexpress selling small magnets as "from flat top to button top":
http://www.aliexpress.com/item/Free...flat-top-to-button-top-NdFeB/32604779265.html
http://www.ebay.com/itm/18650-18350...-Flat-Top-Battery-to-Button-Top-/321296194078

There is not much info about batteries and DC current that i can find but some say magnets has poor conductivity (compared to other materials) and some say they get HOT when passing current. The latter can i attest too. When charging at 2A the magnet connected to the battery negative was quite hot.

SO....

Will i use damage the batteries if i use magnets (preferably rare earth) as connectors for batteries?
Will i have less Volt and Amps then if i had only nickel plates?
Will the magnetic field interfere with charge and discharge?
Is there any alternative non magnetic cylindrical plates (like spacers???) that i could use?

 

[Grizzl-E]

Its not as good of an idea as properly connecting them. Search the forum for guys that have done this. It works for low amperage applications, but since you have asked rather broad questions no one can give you specific answers.

What are you doing with them? How many amps?


Sent from my iPhone using Tapatalk

 

[redilast]

Probably not the best ideas to use magnets for a reliable connection. They are fine as a temporary connection. I've been using magnetic leads on a hobby charger for 5 years to charge batteries usually at rates <5A. There are definitely different grades of neodymium magnets. The ones I use have around 5-6lb pulling force, and are little squares about 5x5x5mm.

 

[Vanarian]

Hi,

It could work but that's not good if you want to seek high currents. Still here are some advices if you do it?

First choose nickel plated neodynium not what you've shown in the link, that's garbage.

Second use wider magnets, and slimmer if possible.

Third get nickel tabs to fold and press between cells and magnets.

Note that your current will be highly dependent of both nickel IR and the maximum temperature magnets can bear with before losing their magnetic power.

 

[redilast]

By the way there is quite a bit of info on connecting batteries with magnets here: https://endless-sphere.com/forums/viewtopic.php?f=14&t=60517