The issue is that "
Bank" does not necessarily means "Batteries Connected in Series".
If Your read again the page where You got the information from (near the top):
http://www.trojanbattery.com/tech-su...y-maintenance/
When You connect batteries in "
Series",
only the "Bank"
voltage increases, the
total AH of the "Bank" will be
equal to the
lowest AH battery in the "Bank".
Also the high AH deep cycle batteries cannot be charged with lower current, it is not just a matter of how long it takes.