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NMC cells do not really require any Top or Bottom Balancing, thus why no EV manufactures would allow you to do either.

When it comes right down to it, only LiFePo4 cells need Top or Bottom Balance because the charge/discharge curves are so dang flat, SOC cannot be determined by voltage. NMC cells have nice SLOPE Charge/Discharge Curves and can be easily Mid Balanced. Just connect all cells in parallel and walk away for a day.

Charge to 4.2 vpc and disconnect at 3.0 vpc. Just do not go over 100% SOC 4.3 vpc, or lower than 5% SOC @ 2.5 vpc. Nothing could be simpler. KISS! Make it complicated, and you make it prone to failure.
 
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