The battery builders club

yelnats8j · July 12, 2020, 2:01pm

That wow at the end killed me.

bwahl602 · July 12, 2020, 2:31pm

You don’t have to charge to full to build the pack. Could do them all at 3.7.

Cells will bleed back a bit. Then again, a 0.1V change is nothing and could be beyond the true accuracy of the voltmeter you have anyway

bwahl602 · July 12, 2020, 2:32pm

Vvvvverrrrry nice looking!

whaddys · July 12, 2020, 4:02pm

you got a link to that tape you use?

Skyart · July 12, 2020, 4:14pm

Yes those are 9p staggered with 5 cells on the bottom and 4 on top then it’s the same thing by flipped next to it

whaddys · July 12, 2020, 7:10pm

I think these are considerably better no?? Maybe slightly too hot?

ZachTetra · July 12, 2020, 7:14pm

How many joules you running?

whaddys · July 12, 2020, 7:16pm

33.3 on 1.5mm nickel

ZachTetra · July 12, 2020, 7:49pm

Maybe 30? I found that the negative ends need a bit more power…so I’d do 30J for positive and 35J for negative maybe? It’s all close enough that it doesn’t really matter

whaddys · July 12, 2020, 7:56pm

totally dude, I noticed this as well. I’ve started changing the J just slightly between neg and pos sides. I’m getting better–this whole art really is just practice. I’m glad I have these salvaged cells and thin nickel to practice with. Perhaps I’ll give away this 13s practice battery when I’m done…

IF IT BLOWS UP HEY IT WAS FREE

Acido · July 12, 2020, 8:02pm

Turn up the current untill you see heat marks, then dial it a bit back more heat is better then less when welding

ZachTetra · July 12, 2020, 8:03pm

Haha, I have a 6s3p of fake 30Q cells with a broken BMS if anyone wants that too

fessyfoo · July 12, 2020, 9:51pm

from my read, that’s the creator of the kweld saying. comparing joules reading between setups isn’t very useful. because it can be inconsistent between setups. it is useful for consistency though.

it does seem like people compare joules a lot though.

ZachTetra · July 12, 2020, 9:53pm

It’s the easiest thing to do, but that’s why I wanted to know the set up he was using, now it’s a relative measurement

fessyfoo · July 12, 2020, 9:55pm

I"m hands up for some dead cells for practice welds. and any advice on practice welding.
and any extra 2mm nickel for the same.

also looking for wide 2mm nickel 25mm or 30mm for my p42a builds upcoming. probably getting that from @iamasalmon when his shipment comes. but putting it out there.

glyphiks · July 12, 2020, 10:16pm

My joules are bigger than your joules

ZachTetra · July 12, 2020, 10:17pm

Big joule energy?

kook · July 12, 2020, 10:20pm

ZachTetra · July 12, 2020, 10:21pm

Damn, you got me

lazopm · July 13, 2020, 4:48am

Hi guys back again with a spot welding safety question.

What’s a good way of welding leads to this positive terminal?

I was thinking of doing this, but I realized if I try to weld the middle strip between cells it could go all the way through to the batter negative:

Any ideas? I only have 8x0.15mm strips.