Parallel felicity batteries

[Mhmd]

Hello ,
I have a felicity lithium battery lpbf48200-S ,6 months age connected to a growatt inverter without bms .
I need to add a new battery lpbf48200-m , what is the best may to do this parallel connection , and can be connected these two versions ? Can be used without bms ? And what is the beat way to do that ?
Thanks in advance

 

[Danke]

Busbar?

Maybe email the company about paralleling them. Ask if the COM ports communicate with each other? Settings, Etc.