Thank you, its more visible from the video how the metal is deformed. Well wish me luck taking my pack apart.
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Might be a stupid question, but what is the best way to get
the cells out of the modules? I put them in the wrong way, and not that all of the spaces are populated nothing really budges. I guess that is a good thing but i canât get them out.
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Try a credit card in the center.
For future, a small strip of fiber reinforced tape attached to & underneath the cells with a bit of slack coming out & doubled over on itself so no longer sticky. Pull up on it & battery pops out.
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I managed somehow. it was really stuck in there. Another question. Is it important on which side of the cell the tab with the foam is located? I imagine its not important, but it doesnât hurt to ask before i put the cells back in.
Huh. newer mind, my kit came with all the tabs inserted and pre-bent so there is no way Iâm bending them all back and reversing them.
dont matter, haha you already got it
This is after about 1 year of usage 12s8p 21700 p42a cells. Marks are on every cell/tab in the pack. After removing the cells all are within 3.94V and 3.91V.
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Hey, Iâm not alone then! 
Good photos, you can see the dot pattern from the arcing quite clearly.
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I havenât checked mine.
Has this only been noticed on the Molicels? Could it be because theyâre slightly bigger than spec?
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I plan to rebuild this battery using nickel strips. Should I run these cells through the âgradâ process on the charger, where the charger will charge the cells to 4.2V, then discharge them and finally charge them again to 4.2V?
i also have these arcing marks in my battery, and some deformation in the modules from the resulting heat.
up until now i sanded them away on each inspection - but for my next build, do you have any hints on how to prevent this ?
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I have not figured out whats causing it. I have none such feedback from ebikers. Maybe vibrations? Wander if its on bottom deck batts or top deck too?
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Its vibrations, the little arcs are the last place the battery touches the contact before a slight separation, and arc.
E bikes have some suspension, boards hardly anyâŚunless you count the pneumatic tires on some.
Is there a conductive paste? I have no idea.
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There are conductive pastes but they will get squeezed out of the connection point when the cell is inserted. Youâll probably still get the same arcing when the vibration starts.
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Wouldnât copper foil/shim be best?
Itâs not going to prevent an air gap from forming during shock/vibration. It will just sit against one surface or another, it has no ability to fill in that space that forms.
U gotta try setting it to wumbo
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I have a question. I populated the modules with cells and apparently some of the contact touched and this happened. Are the modules still safe to use? Any insight what could have happened? I got all the modules warped in an fire safe blanket. Are the cells still good?
Its fine, just some burned screws 
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