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"if the battery in a mechanical mod over-discharges and the device doesn't contain enough air holes to allow the battery to vent, there is a risk of explosion.".
(soundbite of les pommes de ma douche's "trompettes de la renommee") transcript provided by npr, copyright npr. https://oakley-sunglassesformen.us/Holdman-brother-of-Duch-from-Gnodstadt?Lottsmoth=103