I have been individually charging my 4 Battle Born batteries which I had set up in 2 strings of 2 batteries in series for my 24 volt Growatt AIO. It took a few days to get all 4 batteries charged up to 14.2 volts (where the Victron IP65 said it was "storage" state) but now the first 2 batteries charged have dropped down to 13.77 and 13.92 volts. So, I am thinking I need a balancer and am wondering how to hook up a balancer to the 4 batteries. I could get 2 balancers (one for each 2 battery series bank), but I don't know how to balance the two 24 volt banks. I saw the attached drawing for an Amazon balancer which looks like one balancer could balance all 4 batteries. Do you think it would work? I am looking at the image on the top right. Thanks.