When working around mains voltages, it can be useful to know whether a given circuit is live or not. While this can be done by direct connection with a multimeter, non-contact methods are available ...

In early 2014, the infotainment program Inside Edition aired a segment about the dangers purportedly posed by 9-volt batteries, focusing on a house fire reportedly touched off when improperly ...

Use every drop of energy from a 9-volt battery by adding it to an LED Blocklite. I was always stumped about what to do with partially depleted, 9-volt smoke detector batteries. They’re usually drained ...

Here’s another hack that we would definitely discourage you from trying at home, 244 9 volt batteries wired in series. There’s really not much more to it than that, but [jersagfast] takes this setup ...