Expresso,
You REALLY do have to insulate the cells, even if you have to modify the battery box to do it. Although each shell is connected to the + terminal of that cell, remember that the + terminal of one cell will be connected to the - of an adjacent cell when you wire them in series. Even slight cell-to-cell imbalance can leave one cell more positive or less positive than its neighbor and with the extremely low internal resistance of LiFePO4 cells that can make for a large current flow if they make contact (Ohm's law strikes again) and that large current can make large smoke.
I have a question about the cells you just got. Are they drilled for 4mm or 6mm studs?
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