Hi, I have a 10 Amp PMW controller 12V Victron controller that is charging two battery banks with a common ground. The engine starter battery on my boat is connected to the load terminals on the Victron controller, presumably to charge it, and the liesure batter connected to the battery terminals. I've recently bought the boat but the starter battery is old and does not charge. Is this a correct method of charging two battery banks with one PMW Victron controller? Thanks, Steve