Sorry I didn't clarify. I wasn't intending to mix batteries, but switch battery types. I forgot about 14v batteries. Currently I have 3 xsd3400 and a 320a alt. Was considering grabbing 2 more with the rebuild. And no one makes a dual bracket for my Gm 4.2li6 motor.
When it comes to mixing battery sizes of the same brand do you actually gain extra capacity or is it hindered by the smaller battery? For some reason I'm under the impression that you only get the sum of the lesser.
1 40a +2 60a yields 120a total. (just using random numbers as an example)