The expert sources I've encountered say that prismatic battery cases must be constrained and prevented from bulging.? I've divided my pack into 4 boxes of 4 so that I can take the batteries off the boat seasonally.? The boxes are built with stiff sides along the long dimensions of the interconnected batteries.? The boxes are interconnected in series with flexible connectors rather than the copper bars used within the boxes.
My belief is that a prismatic battery with a bulging side is a suspect battery.
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THOMAS VANDERMEULEN