I have 2 batteries hooed up to an onboard charger. I also run 2 more batteries in parrellel when I am cranking so I can fish all day. I was wondering if I left all 4 hooked together would my 2-bank charger eventually charge them all? Right now I have to go through the hassle of disconnecting the batteries, charging 2 with the onboard charger, then charging 2 more batteries individually. Starting to becaome a pain when having to hook up and then un-hook them again. Was making sure I would not ruin anything lol. Thankyou in advance for any advice.