But this is different. They don't even think that soldering can be done safely by professionals. And the risk is not only when you're soldering. It could cause damage that could rear its ugly head at some future date. As the excerpts from the datasheet warn, it could damage the separator or venting mechanisms. The former could eventually lead to a dangerous internal short, and the latter could cause it to explode like a pipe bomb rather than safely vent as designed. You can't possibly know if such internal damage occurred because there is no easy way to detect it without very expensive equipment, e.g. X-ray / SEM (scanning electron microscope) imaging.
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