I think those are the correct ones.
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Iām going off the original picture from cautiously here The battery builders club - #23242 by ApproachCautiously
Looks like these as best I can tell. I think I can see metal shining through so they might be the exposed tab version, not TO 220FP, but maybe not. I didnāt realise how big of a difference in thermal transfer the plastic made, for some reason I assumed it was something more conductive
https://www.st.com/resource/en/datasheet/stb75nf75.pdf
Edit: oops yeah lines beat me to it
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Hi guys,
Does anybody know if Fogstar is still shipping to Europe or just UK? I sent them an email a few days ago and had no response. Iām looking for some p42a cells, Nkon hasnāt got any stock and I donāt know any other sellers.
I have 96 unused p42a cells from nkon that I am willing to sell but they need to be balanced properly.
Not sure if this is the best placeā¦Let me know if it isnāt. Looking for a battery builder to make to larg-ish (16s3pā¦maybe 4p) pack for a minibike Iām building. Actually, Iād need two packs, as Iām building two bikes.
So glad to have found this board. I like to build all kinds of stuff, but I donāt think I want to get into making my own pack - Iād rather leave that to experts in the art!
Send me a message if you are interested. And, thank youā¦Iāve already gotten so much great info from reading this board that has helped me on this build.
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You should set your heat on a sacrificial piece of metal, like a razor blade or an old battery cell. Turn it down until it isnāt blowing through.
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Yeah, I did a practice run on an old cell beforehand and it looked okay. Also tried on just another nickel tab but doesnāt get a good weld on nickel to nickel without going up Iāll try again though. Is it okay to sand down the probes when they start getting dull?
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I use a file to sharpen my probes, and they do need sharpened pretty often. Though dull probes are less likely to blow through than sharp probes. So you might have to turn the heat down on freshly sharpened probes.
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Gotcha
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@A13XR3 @Skyart @JoeyZ5 @TheBoardGarage @BenjaminF
All these are very good pack builders stateside.
Hit @glyphiks up for Australia
Unsure for Europe ATM
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I should be decreasing my weld pulse duration, right? As I decrease, the blow throghs appear to be getting worse.
Maybe it goes against conventional wisdom but I got my best results with slightly rounded tips. Iām using a kWeld though.
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Same. I sharpen my probes less than once a year. With consistent welding technique, the tips kinda get blunted and then just stay that way for a very long time. I get very good and consistent weld this way, and I dont spend a bunch of time sharpening.
When I DO sharpen my probes, they usually are much more fragile for the first 50 or so welds, and deposit lots of little bits of copper until the get blunted again and start to harden up.
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They look too sharp to me. All of that energy is being concentrated at the tip. Get a flat piece of steel that has a lot of surface area, and weld on it until they are rounded off, like others mention. Turn it down until it isnāt blowing through. The sharper they are, the faster they will round off. You never want a sharp point. I tend to only sharpen them when I notice one lead not welding as well as the other, which if I remember correctly, is usually the positive electrode. Iāll leave the negative electrode fairly dull.
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You might not have to turn the heat (pulse length) down at all after you round them off. The rounder the tips are, the more pulse length youāll need, and vice versa. I only have to sharpen my electrodes more often than others because I use welding jigs with very small holes.
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Alright, Iāve got a question for the hivemind:
What is this connector?
Itās 1.5mm 2mm pitch, and not JST-ZH. Itās on a xiaoxiang smart BMS. I ordered a UART bluetooth module to go with it, but the bluetooth module just has a regular JST ZH.
If I canāt figure it out, Iāll just desolder it and replace it with a ZH, but it would be nice to know since all the connectors on this thing are this type.
A round of googling led me back to this forum lol
Looks like it goes by a bunch of names
JST HY 2.0
Yeonho SMH200
https://www.aliexpress.us/item/3256804610679406.html
https://www.aliexpress.us/item/3256804311425355.html
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Well Iāll be damned, thatās it! I must have not been mathing correctly last night when I determined it was 1.5mm pitch lol.
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Hey there,
Just wanted to shoot you a thank you for your videos on building batteries. Thatās where I learned how to build my beasts. I just built 2 20s6p for my builds. I thought youād appreciate some kudos. Thanks again. Keep āem coming.
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