"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." .
here are 4 mass. biotechs making noise at the ash conference so far .
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�this negligence must not be allowed to continue,� budkie�s letter states. �the university of california, berkeley, has clearly failed to follow federal regulations and guidelines.� .