P2 is for programming.
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Made a pretty cool contraption with the things I had at home. Just need to find some copper nails because the things I was using before we’re not good enough.
The contraption includes 5.5mm bullet connectors and m4 screws, and a bunch of tape. I’ll get some pictures later
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UPDATE #41
Hi everyone! @moon Finally got my spot welder working yesterday!
I ended up spending $135 in total on the spot welder. You can get the Sunkko 787A+ spot welder for $140 incl. shipping.
PROS:
- Can be cheaper than a finished spot welder.
- You become really happy when it finally works.
CONS:
- Same price as a not DIY spot welder if you don’t have a car battery.
- Not programmable
Here is a video of a really bad weld. Forgot to take a picture of a good weld…
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Thats sick!
I decided to ditch the spot welder arm for now, if I start making more battery packs I will just put it back on.
I tested my spot welder with really shitty tips I could find and it worked too, I am just waiting on copper nails that I bought from ebay.
Agreed, you can always find the parts that you need to fix it too. For example just stock up with a spare solenoid, buy it from aliexpress it only costs a couple of dollars.
You could also implement an timer.
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Nice! I like the solution you came up with. My DIY spot welder was really ugly. In my defense I was in a hurry to start building and I used parts I ready had it 
Now time to build your battery pack! Which battery are you gonna make?
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10s6p Samsung 30q 648wh - 28.5cm X 13cm X 3.8cm
Limitless range. Cool!
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Yea almost. And you went for a 10s3p? How far can you go on a charge?
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The specs say 29 km, but I would say that with my set up and I going full throttle as much as possible, plus some hills, I reach 20km at 20 left battery so not that much left. If you cruise normally then closer to 30 is possible. 6p is a lot yuu can always think at 11s to gain a bit more power or 12s.
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UPDATE #42
Hi everyone. Today I ordered some more parts…
Aliexpress:
- 1x $7.99 - Battery charger
- 1x $2.56 - Washers
- 1x $3.02 - Ski googles
I also received my dual lock 
NOW TO THE COOL PART!!! (it’s really cool)
Yesterday I went to the library (yea… belive it or not) to get a belt cover 3d printed (link for belt cover on thingiverse (I printed the Cover_Final.stl file)). They got 2 really cool 3D printers (Ultimaker 2 and Ultimaker 3 extended). I payed $5 for it and it’s made out of PLA (plastic). It took 8 hours to print. It didn’t fit with the 90mm wheels so I had to cut a bit off. Now that it’s all good it looks amazing. Really happy about how it turned out! 
BEFORE CUTTING:
AFTER CUTTING:
And here are some updated pictures of the board:
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that’s a great print! 8hrs @0.1mm layer height? I printed mine @0.2mm to gain some time, but 100grit sandpaper, some filler primer and 600grit wet sanding and black paint got me at this point.
!
and then I hit a rock with it 
I think I’ll probably reprint it in some black pla and anneal it to make it more resilient or I’ll have it made by my business in sls nylon eventually
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That looks good! Yea 0.1mm layer hight
It came out really smooth, but I don’t really like the model. I’ll get a different model next time or I’ll make it myself Your model is much nicer than the one I printed.
with 0.1 layers I think you can skip the 100 grit and o straight to high build filler primer and 600grit wet sanding. Then 2-3 layers of paint and voilà! approx 1hr of work in total if you’re really slow 
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I’ll paint mine when my build is done and I got some money in spare. Thanks for the guide!
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How did you solve this?
I know that usually all the problems come from the copper tips
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I think it was the copper tips. After making the pen everything worked. Think it might have been bad connection.
Ok I guess I will wait for the junction connectors before I make any other changes
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UPDATE #43
Hi everyone! I just ordered the last parts for my board today!
FINALLY!
Nkon.nl didn’t have any nickel strip or battery insulators in stock so I had to order it from eskating.eu. They will have more in stock on 22. August. I didn’t wanna wait that long time (obviously lol?)
NKON.nl:
- 65x $278.93 - Samsung 30Q 3000mAh
- 3x $6.82 - Fish paper adhesive
Eskating.eu:
- 4x $13.94 - 1 meter 10mm X 0.15mm Nickel strip
- 2x $4.64 - Fish paper for positive battery
TOTAL: $304.33 AND THE FINAL COST OF THIS BUILD INCL. TOOLS (didn’t have any in the beginning): $1850ish
All there is left to do is wait and then BUILD!
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Well the final part for my spot welder came today so I decided to test it out. It was a little frustrating at first, but every issue I came across was to do with the copper tips.
So after experimenting a little I spot welded single layers on both sides of my cell. I can do it really quick now, no problems - except that I can’t get a solid two layer connection yet. Probably to do with the tips, they kept wearing out for me which is annoying.
But I think I am going to buy/make those 18650 PCBs to save some headache as I have to make another pack after this.
I don’t know why I post on this thread lol. But its the first thing I think of when I have done something with my build
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