Battery didn't got recognized by the paralleler
I've just installed the battery parralleler in my Super Soco, immediately after that I was going to a destination about 70km. The ride to that destination went well, but the way back home there was happening something weird with the battery. He didn't work at all at 55%.. I got the battery to charge properly and I plugged in the third cable of the paraleller. After I did these two steps it all worked again, but it was very weird.. hopefully I won't experience it again.
Super Soco TS1200R
do you get any error code on your display?
if one battery shuts down, my paralleler switches to the other battery immediately (I once had a defective BMS in one of my batteries, therefore I know it)
the paralleler works with relays which can get stuck. in my case the relay for interchanging the battery status in the display sometimes gets stuck at 0% until I hit the paralleler with my hand.