Battery seems fine. How much pressure are you using?
I’m pushing firmly.
The tips don’t look that bad either
That was after some love with 80grit Sand paper, they were mushroomed out before almost touching to the point that I couldn’t fit sandpaper between the 2.
I was the one who wanted to do it ages ago, but only got around to actually trying it out recently.
It works, but I tried it out with a 3s5p LiFePO4 pack, not 4s as I should’ve done. 4s was the intention, and cells ordered as such, but I made an attempt to see if I could solder the cells together, so I tried it on a 1s5p pack and failed. Even cleaning the contacts with denatured alcohol, sanding them to create a better surface area, and using flux didn’t help the solder stick like it should to the cells. I ended up ruining the cells so I was left with a 3s5p pack and resorted to ordering a lipo to spot-weld.
Because of the lower voltage of the 3s LiFePo4 pack, I had to set the voltage alarm to a lower setting to get the spot-welder to work. The timings I used were 12ms x1x1 for one strip of 0.15T x 12mm nickel, and 15ms x1x1 for the second strip, welding to a razor blade. Result was really good though. Solid welds both times.
Talk about an expensive experiment 
…
My advice : if someone wants to do it, it’s possible but if you don’t have a spare 3s lipo lying around and don’t want to shell out for one, get a LiFePo4 pack made by a pro. And go 4s5p at the very least.
Sorry for interrupting. Back to your regular scheduled programming 
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For some reason I had to bump up the ms on my lipo. It wouldn’t weld same as before
I may try that, should the tips be flat or pointed. I have them rounded but I can flatten the tips with my belt sander.
Mine went from round to kinda flat. I just switch sides sometimes. Rounded is fine.
When I get home I’ll try what you said I’ll bump it up half a ms every time till I get a good or bad result lol
keep some sandpaper close, if your tips starts sticking, sand them a Little, then you’re good to go. Also helps to keep them abit pointyish
It’s weird but light pressure works better.
sparks usually means either not pure nickel, or dirty or bad contact. Hm or maybe if the electrodes are too close together it’s arcing between them…
That could be a possibility I did separate them a bit but I’ll try seperating them more. I tested my nickel with a vinegar peroxide salt solution and it did not corrode.
Also like this?
I did a Pen today.
I Will upload the how to video when edited
The corrosion test does not work if you do not grind the nickel properly. Drill a hole or use a dremel. The soul must be exposed or you Will not succeed on the test. Too many sparks weld? = Plated Too many sparks no weld? = Bad contact, pressure…
I’ll try all of that when I get home 
thanks guys.
putting together a 12s6p right now, performed about 1200 welds and not single issue so far.
i did notice the tips get damaged pretty quickly though, i’ve had to either snip off, or resurface the tips every 200 welds or so. when the tips get worn, it was blowing holes through the nickel. the moment the tip got reconditioned, it went back to perfect welds.
at this rate i’m going to have to get new tips so looking forward to your video.
also, are you doing well with your recovery?
Yes. Bless u man
