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It probably wasn't tight all along. OTOH, if the cells in the pack have any wriggling space at all their movement may undo the bolts, even with thread lock.
Bolt should be fine for current, but I'd swap it just so any future inspection of the pack won't bug you and if it ever dares loosen and burn again you'd notice.
I thought about using spring washers on my PHEV buddy pack, but I wanted minimal resistance and worried the washers would increase it.
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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 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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