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can someone please explain this diagram to me? I've not made any battery packs before made of lithium ion cells. and the 3,000 degree fire kinda scares me. I would understand if the battery+ and battery - were the only "intake" places, but what is the "commons" soldering point for? I know that the circuit is an auto draw-stop (sort-of) and an auto fill stop so it can't fill more than 7.8v (I think) and no less draw that 6v. But the whole Commons thing totally throws me out of whack. please help?
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