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Right, but a tiny part of the current will flow through them anyway - even if they are tightened well enough.
When not, they get enough current to burn them, or so it appears.
I agree about the washers. But if the cells cannot move the bolts, once tightened, should not release by themselves anyway.
I duck taped my 12 Ah cells tightly together; heat is not an issue for my buddy packs and the tape provide yet another layer of isolation from the iron boxes that house the packs.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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