i would say yes, just copy stock 7 cell
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Go with A. I recall reading somewhere that side by side packs are better than stick packs.
Revo 3.3 BL---sold
Side by side is by far the best configuration as the cells can/ will be assembled using much thicker connecting bars; end to end ( stock / sport packs ) as assembled with thin tin-foil strips spot welded to the ends of each cell which is why you get burn marks- results in poorer current flow.
Keeping the Mods busy is my specialty...