No, like John said, you can leave them connected as long as no negative charging cable goes to common ground. Multi bank chargers have independent charging circuits, isolated from one another. Floating ground. Each pair of charging cables is supposed to connect to one 12v battery, or to a series of two 6v batteries. Consult your manual on this. There is usually a way shown in the manual for charging the bank as a unit, but it really is better to charge each 12v separately. Again, there should be no need to disconnect the batteries.
Lots of guys tap a single 12v battery in a series bank for auxillary 12v loads such as bilge pump, vent fan, etc, and that is a good reason right there to charge them independantly. Yeah it is sloppy engineering to tap the bank for small or intermittent low voltage loads, but nevertheless lots of us do it. (guilty here) Better of course to only use dc/dc converter for powering 12v loads, or a separate 12v bank, but it is what it is. That is just one way that a bank can be unbalanced, and charging independently makes it largely a non issue.
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