These would probably work well
Honestly I think any reasonably sized magnet would work; you just need a set of welds on each end of your p pack to line up the nickel
Oh yeah. And itâs more than just a tingle when youâre working on a 20S.
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@Jujo @BenjaminF Ok Iâve added those:
So much cutting and welding, I kind of regret not buying some big tape, though I still donât know how you guys know where to weld, especially on positive side, when you canât see shit.
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@Arek You can get a thin piece of plastic. Measure out exactly how far apart the center of the cells are (staggered or stacked) and then use a hole punch to punch out those holes. That should tell you where the positive tabs are to spotweld
I donât do that however. I just eye it mostly because I know the tab should be in a straight line left and right and pretty much line up and down to the staggered cell below
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i weld by sense of smell.
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Florida man at it again
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you have to have a keen sense of smell in florida to avoid the meth peddling crocodiles.
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If your crocs got the rocks, Iâd actually be using my sense of smell to try find them
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You need 24 of those!?
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I had an old lipo that Iâve basically forgotten about, it hit 2.5v per cell and I figured I might be able to trickle charge it and use it in low load scenarios as a little supply of 3s powerâŚ
But itâs cells have an IR above 30⌠each one of them. So I figured It would be safer to retire it.
How should I best kill it off?
I think you could attach a constant current load like a small light bulb, discharge to 0v, then stick a knife through it a few times
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No, no, no!
Never penetrate the pouch or can of any cell! Thereâs just no need. It does nothing to help âretireâ the cell and can easily lead to a fire, even if the cell was discharged.
Even after discharging down to 0V a pack will rebound back up to at least 1V per cell. This can provide just enough energy to cause a little spark that ends up igniting the flammable solvents in the cells that you are now releasing by penetrating the LiPo pouch (short circuiting the layers).
Just discharge the pack down to 2.5V or lower and tape the tabs (or ends of a round cell) well and recycle the pack. No need to physically do anything to the pack, no need to use salt (can cause all sorts of problems).
Never try to discharge a LiPo pack to zero volts either. If the cells are not balanced at those low voltages then one will hit zero volts first and, if the discharging continues, that cell ends up being charged in reverse. This can cause a fire and/or explosion.
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Those may be a better option for my ebike than the honeycomb i just bought. HmmmmâŚ
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At 2.5V itâs already dead. 
Thereâs only a tiny bit of energy left in the cells at that voltage. You can just tape the connections or tabs well, to prevent a short circuit, and recycle the pack.
If you really wanted to you can discharge each cell individually to zero volts but itâs not needed.
DO NOT TRY TO DISCHARGE A LIPO PACK TO ZERO VOLTS!
If the cells are not balanced at those low voltages (theyâre not) then you can easily drive one cell to below zero volts. If you continue to discharge the pack then that cell is now essentially being charged in reverse and that can lead to a fire and or bursting of the cell.
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Weird, I guess wherever I read that about puncturing it was incorrect. I havenât needed to dispose of any recently
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There is a stunning amount of bad and even dangerous info out there about LiPoâs. 
What did they say the puncturing did to help? I canât imaging how they could think that releasing toxic organic solvents and lithium salts would be helpful or how possibly short circuiting cells that might not have been completely discharged would help.
Even if the cells werenât shorted and no electrolyte leaked out, how can they say puncturing helps versus just discharging and taping the pack up? I am definitely confused. 
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All I did was use a bulb for about 30 seconds (only amount of time it stayed lit) checked it with the mulitmeter, (still 7v) and then threw it in salt water with the leads cut offâŚ
Is that wrong?
I donât even remember, I have never done this to a cell but I thought it was on some recycling thing. Forget it anyway lol your way sounds less dangerous in the first place