Is there an issue with the positive of the charge port being way longer then the negative of the charge port
No. Donāt forget a fuse.
2 Likes
yep fuse the posiitve right?
already got a 15amp fuse attached to that
also is it worth fusing the main discharge?
would need to be like a 500amp fuse though
1 Like
I donāt use a fuse on discharge. I trust my battery to melt my ESC and open the circuit before a thermal runaway
5 Likes
Couldnāt have said it better myself 
this is perfect
6 Likes
Given what little I can see at that resolution, it appears that the pack as a single nickel strip acting as the series connection. Thatās a very poor design choice for several reasons, including but not limited to the following:
- nickel is not very flexible, especially when oriented vertically and lengthwise along the deck. Any miniscule amount of flex will lead to fatigue and failure.
- Nickel is not very conductive, compared to copper or aluminum, for example. That low conductivity, combined with the fact that itās one thin strip, means there will be significant voltage drop and heat generation if you try to pull 60 amps through it. It might even be enough to melt the heat shrink or cause a fire.
TLDR; no, I donāt think a pack of that design will/should be able to handle anything close to 60 amps continuous.
That is an accurate chart. Now you see why nobody on here uses nickel strip for the main series connections unless itās super wide (0.15 * 60+mm).
1 Like
For a 12s8p P42A, would one layer of 30 x 0.2 mm nickel be sufficient in this configuration?
The cross sectional area is 161.3 * 0.2 = 32.26 mm^2 which should in theory do 200 amps continuous with ease. I think the bottleneck is the welds not the nickel.
2 Likes
I agree.
2 Likes
Does this mean the 5A for each individual welding spot or pairs?
Each pair is 10A, but you can do more than 8 welds on the positive terminal and usually 6 is fine. But if you have a lot of cells directing through different sheets Iād make sure to get more in
4 Likes
Well, for the given number (24 welds / 8 cells), that works out to three per cell, so I assume thatās pairs.
Thatās worst case though. If itās per weld instead of per pair, that would improve things to 240A.
edit - ninjaād. I think as long as you donāt go light on the welds (at least 3-4 pairs per end per cell), you should be fine.
2 Likes
@BruSkater, this is how to properly do a high current all-nickel series connection. Note just how much more cross section there is compared to a single 15mm strip.
I realize that this is for a brick rather than a plank pack configuration, which makes it much easier.
For a plank config, the best bet is to use copper wire or braid for the series connections. @ZachTetra has some great examples of the proper way to do it.
4 Likes
Hi has anyone bought their cells from https://www.bulkbattery.com/
Wanna make sure the cells are legit.
4 Likes
https://forum.esk8.news/search?q=bulkbattery
I was somehow the first person to post a link to their site on this forum
2 Likes
This is excellent advice. Please could you edit
to 65mm by 0.15mm incase someone else gets stumped by your workings out. Ta
1 Like
Well I feel like a fucking knob for paying for shipping all this time lol.
Bulk battery free shipping discount code coupon code bulkbattery
4 Likes
So these are legit as they only have 15 followers on IG and Jsut never heard of them in here before.
3 Likes
Yes they are totally legit. Great quality cells, great prices. My go to.
They are the wholesale site for https://www.18650batterystore.com/, if that makes anything clearer.
2 Likes
Cheers guys Iāve been waiting for fogstars wholesale for like 2 weeks and seen this works out the same price so will give them a go. 
2 Likes
They ship to Europe?
2 Likes