But one of those things could cause a fire - a 9-volt battery. Firefighters showed why it's a danger. With fire extinguishers and a crew standing by, Chief Kevin MacCaffrie demonstrated.

In a power outage, a 9 volt battery can give your phone enough juice to make a call or send a few texts. You may have seen this hack before , but it . Skip to Main Content.

Not if you keep a 9-volt battery handy in your glove compartment. It's possible to revive a dead cell phone by using a 9-volt battery, along with something metal like a key, and your phone's car ...