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please help me with setting up a SYL battery with my multiplus II 5000VA. I especially need help with communication cables.
The battery has 3 COM 1/2/3 ports
I connected COM 1 with multiplus via Ve.can bus type A. I made a parallel battery connection via COM 2 ---> COM 2. via rs485 Is this involvement right? 
Has anyone encountered this type of battery yet? + I am attaching pictures of the battery ports / appearance of the battery
The battery BMS is unlikely to communicate directly with the inverter. The rs485 on the inverter is VE-direct protocol, but the BMS in your battery will have it's own protocol, so a Venus interface will be required that can communicate with the BMS.
Look at:
Victron VenusOS driver for serial battery BMS - LLT/JBD / Daly Smart / ANT / JKBMS / Heltec (VenusOS v2.80 compatible)
Whilst this does not cover your specific battery, it may give you a starting point.
today I tried to use only one battery and connected it via CAN - COM1. Victron found me this battery and gave it the name LG resu. Is this a problem?
