So I managed to connect the batteries to my Octo, needed to make a cable up with pins 345 on battery input, going to ve.can 378 pins.
Between batteries is just a standard network cable and you need to change dip switches so it picks up two in parallel one master and one slave
Had to first figure out that you need to change the ve.can settings on the Octo to (can-bus BMS)
Only after that did it pick up the batteries and all settings are already set and all values come up ect
