Probably what @Skyart said, you have too much resistance due to the long cables. I had the same problem and shortening the cables solved it.
This is definitely your problem. Can you make an XT90 parallel bus rather than those stacked adapters? Basically a bunch of XT90 Males with all the + soldered together and all the - soldered together, all to one wire that goes directly to the welder.
I think it was @ducktaperules who made something like this? Q do you have any pics of this?
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cutting and soldering a bigger wire on them would be best in my opion, no chance of it getting loose or bolt to pierce into a cell with vibration etc other wise hardware store is you best bet (if you find one in copper that would be the best) you doing a 16S 12P right?
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Looks like you’re also in NY. If you’re willing to send me a cell I can do a discharge test.
This is my first non pcb flat pack…Definitely a lot of room for improvement but I am pretty happy with the results. Give me some feedback if you would. Also a huge shoutout to @glyphiks for all the help and tips that he gave me along the way. Thanks for everything man.
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My roommate sent our batteries to the wrong address (his parents house). His dad sent them here (Georgia to San Fran) and this is how I got them. According to the note in the package this happened 5 days ago. I’m assuming the box broke and they spilled out somehow. Do you guys think they’re fine?
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see if you got any voltage dippers and physical damage then send it yolo
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I’ll definitely let you know if I decide to know about it.
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Holy hell… 
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Have insurance? If so, cash out.
No but only a few seem to be noticeably damaged. I’ll check voltages before I use them but it looks like I’ll be taking my chances with the ones that look fine.
I’ll take what you don’t want 
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I’m sure I’ll find a use for them . Flashlights or something for the real bad ones and the rest on my friend who sent them to the wrong address’ pack LOL.
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eek that looks expensive.
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lmk if you get this sorted out
If it was sent with Priority Mail then there is a built in $100 insurance.
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$50 free
The battery leads are just too long for that massive current. I had that problem with my Kweld, I had to shorten the leads from my car battery to the welder down to 10cm.
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Shorten + thicken those power leads as much as possible, and ditch the stack of connectors.
Also those tips look maybe a little blunt?
Make sure the lipos are charged and happy (And warm. Lipo batteries like to be at least room temperature, if not a little warmer, for best performance.)
Try holding the welding probes and applying pressure manually rather than using that handle thing.
Sacrifice a toaster to the machine gods.
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