Also, 60Ah batteries are going to handle 'fun' discharge rates much better than the 40Ah cells. I think the 40Ah CALB CA cells have been tested at 10C discharge (400A) and they can handle it. But, the 60Ah cells are only at 6.6C at a 400A discharge. Therefore you'll have less voltage sag and more available power. It will also be easier on the cells and improve the life of them because you aren't 'beating' them as hard.
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