You wouldn't need to grind/sand them down. Just press them down really flat, then spot weld over top them. The nickel is soft enough and should deform around any raised dimples
From my experience some light scuffing is required on some cells for soldering... so I know that coating is there, but your environment will dictate if it's a bad idea or not.
For me it's more a time / processing thing.
14s 80p = 1120 cells x 8 welds per cell = 8960 tabs to be ground.
I don't have the time or patiencefor that if I can just solder or spot weld over it.
You "can" sand/grind off the spot. Yes, there is a protective layer on it (most are nickel plated steel). So keep the grind spot small and when soldering, make sure to cover the spot completely.
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