You’re looking for a simple solution to charging ur lipos with one plug is what ur trying to achieve…
You’ll need to install a lipo BMS that can handle the 50.4v and a charger that can charge it …only way to charge with one plug… Otherwise you need to charge parallel and plug each pack in
The best way is with a bms and a (laptop style) smart charger. BMS $80/Charger $30/Female charge plug $2. Then everything can stay in series and you’ll have one simple plug to connect when charging.
You can do this - I do it with my 12s setup. I have 2 external balance connectors and I charge one (bank of 6) at a time. but NEVER NEVER NEVER try to charge both banks at the same time. You will generate a lot of smoke.
I don’t know actually - it seems to me that unless you physically disconnect the banks then the ground plane of one is the V plane of the other one, so if the charger is expecting the ground plane for both banks to be the same then that is the smoke of which I speak.
but if you only have a single 6s charger you can just charge the first bank then the second bank. Balancing just means that every cell gets charged to its capacity individually, it isn’t necessary (correct me if I’m wrong) to balance charge all of them at the same time.
I also have a 9s that I do the same thing with - charge 6s first, then charge 3s.