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Low voltage on Cell 1 with EMUS BMS

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I have EMUS BMS in two vehicles and both have problems with voltage on call nr. 1. I have tried to switch position of cell 1 and 2 but the problem stays at cell 1. After 2-3 month the voltage of cell 1 drops 10/100 compare to the rest of the cells. I use Cell Group Module in combination with separate Cellmoduls

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