FCC Technician Exam Question Of The Day (T0A09)

Q) What kind of hazard is presented by a conventional 12-volt storage battery?

A) Explosive gas can collect if not properly vented

NJ2X Notes:
Hydrogen when mixed with oxygen forms an explosive gas which can be easily ignited by a spark or open flame.  Hydrogen is produced by 12-volt lead-acid batteries and can collect if not vented properly.