i’d like to buy a 18650 36v pack in europe to be shipped in berlin.
any suggestions? 
Let me know if you havent found anything by Sept. I should have my spot welders up by then.
Where are you located monkey32? I might be interested as well in the future.
P.s.: probably somebody has posted this already, but all you need is a transfo from an old or broken microwave and some creativity…
I can build you a custom pack, or check out my tutorial on building your own if you want to go DIY but as your asking to buy one I guess you don’t want that haha! How To Build Your Own Spot Welder From A Microwave!
This is a 10s2p pack I’ve just built for a friend,
beutiful build! @Jack
it ispired me to try and build my own pack of 10s3p i already have an amature soldering station plus ive got an old microwave lying around that i can try making a spot welder out of.
could you explain me how i should be welding the 30 batteris to make a 10s3p in one flat formation? not sure what formation would be better 10/15 in 2/3 raws or two 15 on top of eachother
I bought lipo batteries and modified them. from this: ->
I came to this: —>
Additionally on every side is a carbon fibre plate for protection…
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Batteries cost me 52Euros each, carbon plate around 15 for two packs and the shrinking tube was around 8 euros but I have 1,5meters left!
All I had to do was to separate 2 cells, flip them to the side and connect the cells again. Then cut the carbon plate, glue the plates on the surfaces. Shrinking tube around… thats it!
I have 8s with 20.000mAh now… Cheaper and easier is not possible I think.
You need a soldering iron, a cable, I used 8AWG and a heatgun.
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where did you get a 4S 20000mAh battery for 52€? Got it - I think you have these ones correct? They are 4S 10Ah - so you either get 8S 10Ah or 4S 20Ah depending on the connection. NOT 8S 20Ah.
Yes you are right I noticed it after posting sorry for that… yes these are the batteries
Hey… Since I’ve got two of these Batteries in spare I can modify them and post pics by this weekend. Before I ordered them on ebay, but the seller said they are out of stock and he will refund my money, then I ordered them via hobbyking. And finally I got 4 of them @Maxid or Others: I would sell them modified if you want, I only charge the material costs and the costs I had for shipping etc… Could send them to Berlin from Germany (Freilassing) on the 4th of july, from Austria next week but there are more shipping costs. @listgaus I’ll post a tutorial on this weekend and send you the link afterwards…
Is carbon fibre conductive?
Yes it is. 
Well let’s hope that no two solder joints touch the carbon…
Or your going to use, some kapton tape?
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Pure carbon is, but the resin it is molded in is not. so it should be no problem
Oh, thanks for telling me. Seriously, I learn something new everyday on this forum. It is so good.
Then let me tell you that carbon is good thermal conductor too! One big sheet of heatsink.^^