Thanks for the replies. I’m definitely tempted to buy your stuff. Looks like a good option, but I was thinking about .2mm stuff at first. I’m sure it would be nice to weld with though. Any idea how many amps it could carry with a 6p configuration?
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Enough for the cells we use today imo
Unless you’re doing a super edge case p45b pack, then you might have to stack it.
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Yea you’re probably right. I’m not sure my cells will exactly be a powerhouse either. Thanks, I’ll order your stuff 
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I am using the ltt Bluetooth smart bms with a lot of my packs, but I wanted to have more data.
These are pictures of my NUC (can also be a PI) running HomeAssistant. I am using a plugin that can check ble BMS for you. This way I have a history graph of every number and can check the batteries when I’m not even at home + send me alarms if something is not right.
If someone would like a quick tutorial on how to set this up I can always write one 
I didn’t put much effort in the UI, but you can make it a lot less bloated, I just threw every data point in there…
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That’s is cool asf. I would love a tutorial.
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This is very unimpressive I know. I just want to be part of the battery building gang! First one underway 
@glyphiks sent me a tonne of stuff to get started so thank you muchly!!! These little jigs were part of the care package and make things way easier 
Half the cells came from a builder over East. Thanks @Kaydo for a great price and some already grouped. I’ve tested all cell voltages and all good to go between 3.49-3.51V.
Hoping to try my first K-weld welds tmw night using a car battery to power it. Very nervous 
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Start the time low and work your way up, it’s fun and kind of relaxing. Did you already buy the car battery? Make sure to pay attention to amp output. I ended up needing an rRV size battery for .2mm nickel
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Thanks. It came out of my Mrs car a while back. She thought it was toast and got it replaced but it wasn’t. I charged it up a while back and it’s still holding charge fine. It’s probably a tad too small coming out of a Hyandai ix35 but only just. I’m hoping it’ll do the trick.
Can I be charging the car battery at the same time I use the K-Weld do you know?
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The trickle charger yeah I’ve left that on while welding, welding surprisingly brings the battery down quick. I think @DuckBatterySystems does that too.
What size nickel are you using? Cause if it’s .15mm you’ll likely be more than fine.
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Yeah cool. I’ll trickle charge as I go then.
Not actually sure how thick the nickel is as Kayde sent some tabs for me with the cells I bought from him. Glyphiks threw some in the package i got from him too so will check thickness tmw as come in from shed now.
Lead acid /SLA/AGM batteries like to be full. I leave my welding battery permanently on the charger, even while welding.
All of the nickel I sent you in rolls was 0.15, but the pre cut tabs vary, some are 0.15, some are 0.2
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Great to know thanks!! And super appreciative man. If this little 12s3p goes ok then it gives me confidence to go bigger later.
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Cool, I happen to have a Pi collecting dust. I would love a tutorial.
Thx bruh 
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A word of caution: if you have a super cheap shitty charger, I’d recommend not doing this. I had this kill the arduino in my maletrics due to some kind of voltage spike. But then again, many people do this without issue, so idk.
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I have 1 group acting a bit funky, nothing crazy but 0.070v difference after draining it to 3.3v(45%)
its such a big battery its almost a non issue except today i charged it a bit more than I normally do (charger stops a few volts before max voltage), and that same group is now holding more of a charge than the rest. its at 4.19v vs 4.15v on the rest of the battery - this was also a slow overnight charge at 5a
normally when it charges it balances nearly perfectly, so im stumped on what could be the issue. I highly doubt its a weld issue as there are alott of welds on this one, no less than 6-8 welds per terminal
How many cells do you have in parallel? If it’s past like 10p you probably have a broken weld.
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I’ve been building batteries for the last few years, but just completed my first MTB battery. This is a 12s7p P42A pack for my Haero Bro deck. Thanks @ShutterShock for the nickel source! Will be buying more in the future.
First, I did some layout work to make sure the battery would fit in the enclosure box:
Then completed the spot welding phase:
Balance tabs pre-tinned:
Pre-sorted the balance wires to avoid overlap:
Balance wires soldered in place:
Power leads soldered in place:
Shrink wrapped:
It’s tight, but fits just right!
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Nice! That was a pretty quick build haha
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