They’re charging! Cable management for the mains will be some more hot glue into the battery gaps, I measured that beforehand.
Just doing an initial charge before shrinking all the PVC wire tubes around the solder joints, and I still need to add the XLR charging port, which will most likely be to the serial connection wire instead of the battery packs.
Excellent solution!
My experience with battery packs is probably the same if not less than yours, I’m trying to wrap my head around stuff as well. So my diagrams would probably not be the safest bet.
Where can i find a data sheet on these cells. interesting…
Do I need fish paper between the p groups of I’m planning on glueing them directly to each other with no play between them?
If there is absolutely no play, then no. But IMHO, fishpaper is not expensive and doesnt take much space but you extra piece of mind.
Can I hot glue directly to the fish paper or do I need some other adhesive to hold the battery in one piece?
Hot glue the world 
what you are proposing is fine 
Ok then. Fish paper it is!
The bms is really good, but beware it will drain your battery if you leave it turned on
i bought plastic rings for 20700 off aliexpress
Living in Minnesota, I have about a 4 month span that I can’t ride. About how fast does it drain the battery?
I know it’s too late but I really think doing this kind of thing is a lot lot lot better (the trapezoid is double wide nickel)
I don’t know about all the different sized nickel and layers. This will ensure each p group behaves slightly different in the long run.
And I circled some parts that look a little scary.
Maybe shoot us some diagrams for your next steps before you commit?
This type of BMS have I think 2 different self discharge rates. And various models (and with how recently it was made) have different behaviors. The good thing is you can check it with your phone easily. The bad thing is you kind of have to check it once a month or so. With 4 months down I’d put the pack at storage voltage, then disconnect the pack including the balance leads?
Just switch it off/unplug
It took a week or so for a drain of 1.5v per cell
But thats with a bt module
The different length nickel is just due to human error and the different widths is because I ran out of the 8mm nickel strips and I had to use the 5mm ones that came included with my spot welder.
Is it a big problem?
Why is the trapezium shape better?
With the way you have it it’s hella lot of work cutting all those strips, and they come out all uneven. And you have basically a line connecting 5 cells. With the trapezoid you will have way way less cutting, more consistent electrical paths, and current sharing will be even. And more metal, so less resistance.
If you have all these different amounts of nickel on each p group, the resistance for the p-groups will vary. If the resistance varies, they will charge and discharge at different rates. Your pack will always be drifting out of balance, and cells will wear at different rates. This effect might be so small as to not matter, or it might be annoyingly large. A lot depends on how the rest of the construction is done (series connections).
