I've wondered the same thing. I think it is highly unlikely the Seg batteries would catch fire. They are, literally, "bulletproof." I remember a Valence Saphion promo video where they shot the cells with a gun. No fire. Regular lithiums burst into flames. So, I'd feel OK in using the voltage supply trick on a pack that still has Saphion cells, but I wouldn't be as confident If trying it with a rebuilt pack. Some accounts I read in which individuals revived their own packs said it only took a matter of minutes of supplying voltage to a dead pack (showing less than 10 volts) to bring it back up to a "chargeable" state.
Also, as Jason from MTO mentioned, even successfully reviving a pack doesn't mean that it doesn't have bad or degraded cells. It may have a couple bad ones but is still perfectly useable. For how long becomes the question. It's amazing that a lot of these Segway packs that are ten years old are still kicking. It's a testament to how well the cells and BMS are engineered. But as Don mentioned, the only way to store the Seg unplugged is to remove the batteries. Otherwise, they risk that early/untimely death.
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