I mean electrical connection, can i put the wires in parallel including BMS, so there will be total 3 batteries

Hi, I am new to forum, but already have done dashboeard flash and custom firmware, but it was easy, an there i did not need help. now I want to connect one more external battery. so is it possible? on the motherboard i found only 2 battery connectors, one is used for internal battery, other for exte...