@Achmatsorry to bother, but I've read/watch two methods for battery balancing.
1) Charge 100%SOC existing Battery Bank and charge separately new Battery(s) at 100%SOC, then connect together with BMS, cables, others.
2) A youtube procedure, which I assume to Discharge my existing Battery Bank to similar %SOC (Green Led Lights) of new Battery(s) and then connect them together as youtube video, before connecting to Inverter.
I'm an Off-Grid user with no AC-Input, so would like to confirm if can be done option 2), or is mandatory follow option 1) procedure (Very Good Sunny Day).
I did not find a Pylontech Official Procedure. Regards! and Thank You!