I usually have the probe wires running over my hand, so can feel when they start to heat up it’s time for a beer break 
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How do you plan on charging this guy?
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Single use pack
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My biggest fear
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That’s gotta hurt 
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It’s probably a charge and discharge thru the same port bms.
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I thought that might be the case too, hope so!
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It’s a same port charge/discharge BMS from dickyho.
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This is a noob friendly board that I can borrow to friends.
For slow welding, maybe a battery or two per year, a lipo will be sufficient
If you want to weld for longer periods of time, a little faster then you will need capacitors because lipos will overheat and blow
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12P * 15A=180A // 12P * 20A=240A
12P * 3Ah=36Ah
8P * 35A=280A
8P * 4Ah=32Ah
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40T testing determined it was more of a 25A cell or 30 if temps are controlled. So that brings it to 200A continuous on the pack with 1382Wh versus 1,555Wh on the 12s12p
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Yes, those are the specs on paper 
All this means nothing in real world situations. I’m really curious how it will go. I will update you in a few weeks, when we finish the 2nd prototype.
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To be fair, just about everyone else is happy with lipos. 
If you’re building for yourself and can take your time, lipos are great. If you’re building as a service, have done it a bunch of times so you’re fast, it’s not hard to push it and blow up the lipos.
@Acido did you get the capacitors? Much better?
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Bench testing correlates to real world testing? 
What is the information you seek?
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I’m looking more for acceleration, top speed, range and max A.
I’m sure most people here would go with the 30q because it will have more range. With a battery that size the difference in acceleration will be negligible since I don’t think you will even come close to pulling that many battery amps. @Chricious
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Oh, I have already the 30Q and I maxed out 114A battery and 160A motor current in 80A setting. Next test will be at 90A and if the temperature is fine, we will try 100A each. I think at that point their will be a difference, but not sure in which direction though. Range should be in both setups more than enough, but I’m curious to test it anyway.