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> extremely bright flashlights (think car headlight bright, and also usable as a self-defense weapon in the spirit of the old D-cell Maglites)

Using a device which is mostly lithium ion batteries as a weapon? Even scarier than you expect, if you puncture a battery

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First of all these flashlights are very sturdy, and second, if you need a self-defense weapon, I don't think a slight danger of the weapon bursting into flame, post-use, is a high priority concern. The battery pack is a relatively loose fit, slide-out item inside a metal tube. All the charge electronics including connectors are part of it. The flashlight actually comes with an alternative battery pack that takes (a lot of) AA cells.

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