Will opened one in one of his videos and said that they had a great BMS inside, gave it a great review. I have watched all the YouTube videos I could find. I’m not very knowledgeable when it comes to lithium batteries but I got the impression that the communication ports are for the batteries to communicate when being used in large battery banks.
They only have a cell balancer. You dont need a BMS. Your charge controller is specifically and fundementally designed not to over-charge. And lifepo4 does have a resistance that cuts charging from any charge spurce like any other battery. Instead of coming in around 80% and progressively increasing, it happens at 97%-99% and shoots up very fast.
And an inverter prevents under-charging. As well as being with the batteries all the time such as vandwelling.