fuuuuuuug yaaasssss. Nice my dude! Well then, when do we ride…?
It stays like this and it doesn’t do any more noticeable balancing so far… But will report back…
balancing is usually painfully slow and some BMS wont balance if the cells are out over a certain amount. just wait and see what happens.
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In the settings you can deactivate the option ‘bal. only when charging’ Then it will be passively balancing all the time. Still will take a long time though.
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This is bugging me too much.
Didn’t really found a specific topic…?
Anyone else would like to shed some ideas before I create a topic?
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Doesn’t matter so much here, but, be super safe on the ends with the diagonals! I would air gap or add a thin piece of plastic. Personally I’d do more than just fish paper there.
Also if you use braid instead of silicone wire for series, be conscious of the direction of flex of the deck and make sure things have room to bend.
Yes you could absolutely add P groups in series to increase the pack voltage. You must also replace the BMS and rewire the balance leads for the pack.
As cells degrade, their capacity degrades. If the new cells differ to much from the others, the BMS may have trouble preventing drift because of this. Use the same cell type and monitor. Set them to the same voltage as the rest of the pack before adding it in. Its not ideal, but definitely doable
Bill
only with groups that have the diagonal connections. I read somewhere that you want to isolate all the tabs except where the series connections are made, I always have, might be overkill though…
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Much appreciated! I might have been high, but taking new cells and, I don’t know, giving them 30-40 discharge-charge cycles to even up the packs seems not too stupid?
@Wisp - so currently I set the so called “static balancing” option in my BMS.
I also did a quick mountain ride for around an hour.
At the moment the lowest to highest cell deviation is around 0,05V - lets see how it looks when it’s done 
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Dude lol.
One thing I’d like to add, not all cells have the whole can negative. A123 are the opposite. Body is positive.
Also interesting, the positive terminal is aluminum, which shakes things up when welding/soldering.
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I like the sanding drums
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Stone wheels for stoners…
We don’t wanna hurt ourselves… Or other mammals… Or the cells…
Puff…puff…pass
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This might sound insane… But I’ve used a mini belt sander in the past and it works amazing. Can destroy the shrink wrap, but it takes ~5 seconds a side.
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it’s good to know all these dremel bits are safe for batteries. I was way too scared. got 100 cleaned up with the stone bit on medium, they feel nice and smooooth
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Also I have a p-group out of balance on a 12s4p; I’ve located the group but have no idea how to balance separate groups. Should I get this thing/can I charge seperate groups with this? I’m getting into building batteries anyway, is this something I should have anywya? https://usa.banggood.com/HOTA-D6-Pro-AC-200W-DC-650W-15A-Charger-With-Wireless-Charging-for-NiZnNicdNiMH-Battery-p-1480536.html?gmcCountry=US¤cy=USD&cur_warehouse=CN&createTmp=1&ID=477586157193&utm_source=googleshopping&utm_medium=cpc_bgcs&utm_content=frank&utm_campaign=pla-usg-all-pc&gclid=Cj0KCQjwhZr1BRCLARIsALjRVQPpG8XkiXSIPfkU6YdN0EPqTMFpHdHgW4ELD-lSwNdRSA9PFQBtDoUaApflEALw_wcB
F’ me! Thanks. I’m playing around with those cell for the first time soon.
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I think he used 25mmx.15 nickel off Ebay, I got my last batch from Bangood. You have to buy a bunch to make it worth it, kind of a specialty item.
Some people that buy this stuff in larger amounts than I do might be willing to part with some 
@Wisp / @mutantbass
So yeah… I let the static balancing on for 12 hours now. It seems that the row 11 can’t hold more than 4,10V of charge… this means whenever below the deviation will only be around 0,03-0,05V but when the other cells go near full charge 4,20V the row 11 wil always stay at 4,10V. Also Row 8 can only hold a charge of 4,14V.
So those two rows (in total 2x 6 cells) may be a little damaged which might be possible because on one ride the pack got pretty low once so I guess I will live with that deviation for now.
It’s not killing me I was just wondering.
Thanks for the help anyways
EDIT: Also I think that after some more use and discharge / charge cycles the pack wil eventually even out after time…
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