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I believe that guy was using Lithium-Ions, not Lithioum-Polys. Li-Polys are less dangerous because they have a soft shell. With the soft shell when overcharged Li-Polys just bloat and start leaking instead of exploding as the metal case batteries do.
If you have a good quality charger designed for Lithium batteries and you don't abuse them (overcharge or undercharge them) then they are no more dangerous than NiMH batts. All batteries can explode and catch fire if they are abused or overcharged so you should never leave any type unattended when quick charging them.
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