low section voltage, BMS cutting charger off

variv

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Hi,

I have this 5 year old 48v 13s5p 17,5ah battery, it stopped charging to full voltage (54,6). Charger stops at 52,6v. I assume its because one of the sections has lower voltage and BMS stopps charging when other sections reach max voltage.I have a hobby charger I could use to balance those cells.

I assume I have 13 sections to balance, as you can see on the picture I have 2 x 7 pin balancing wires on the sides of BMS, does anyone know how to connect charger to access all 13 sections of the battery to balance it ?

I already fabricated 2x single pin connectors for the charger.
 

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