Then line up your 9 volt battery, with the big (negative) battery terminal on the spring, and the positive (smaller) terminal touching the button in the center of the car charger. Then just hold ...

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 ...

When a battery jumper pack is used as a memory saver, one must be very careful to not allow the disconnected positive battery cable terminal to touch vehicle metal or the negative terminal.

Roost. I admire Roost's approach to smartening up the home one 9-volt battery at a time. The company's latest gadget looks a lot like the original Roost Smart Battery that fit into your smoke ...

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.