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Speaking as one that has many many... many... real world experience in soldering I can vouch for the relative safety when soldering closed li-ion cells. I say relative because I doubt anything good will happen if you gouge an iron into the cell for 10 minutes... I have, and probably will in the future, soldered these cells together. Definitely use flux as described in this instructable and be intentionally "quick" about it. Get in, get out, enjoy. I have even soldered to li-po cells and this is easily doable as well just... not as "safe".
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