Instead of each individual battery having its own leads..why not use a 36V charger and charge all the batteries in series? Then you only need 2 banks (1 for trolling batteries and 1 for cranking). I use the dual pro eagle series i3625 36V 25Amps with a RS1 12V 6 amps mounted to it. Then use the quick connects that stay connected to my batteries all the time. I just plug them in when its time to charge.