Understanding if problem is BMS or cells
I'm trying to repair an e-bike battery that shows charged after 5 minutes on the charger, but can be used fo just a few km. I took internal resistance with a 1khz tester on each 4p pack (this is a 4p10s battery). The results are: 1) 3.56v - 41mohm 2) 3.81v - 41mohm 3) 4.0v - 24mohm 4) 3.75v - 41mohm 5) 3.6v - 35mohm 6) 3.63v - 33mohm 7) 3.71v - 48mohm 8) 3.51v - 52mohm 9) 3.52v - 58mohm 10) 3.49 - 45mohm.
It seems to me that the BMS is doing a bad job of balancing the cells, because the inner resistance looks good to me. Would a manual balancing of the cells to 4.0v be a proper solution?
I'm trying to repair an e-bike battery that shows charged after 5 minutes on the charger, but can be used fo just a few km. I took internal resistance with a 1khz tester on each 4p pack (this is a 4p10s battery). The results are: 1) 3.56v - 41mohm 2) 3.81v - 41mohm 3) 4.0v - 24mohm 4) 3.75v - 41mohm 5) 3.6v - 35mohm 6) 3.63v - 33mohm 7) 3.71v - 48mohm 8) 3.51v - 52mohm 9) 3.52v - 58mohm 10) 3.49 - 45mohm.
It seems to me that the BMS is doing a bad job of balancing the cells, because the inner resistance looks good to me. Would a manual balancing of the cells to 4.0v be a proper solution?