Okay, so you know how it absolutely sucks when you're exploring the polar icecaps and your flashlight craps out at sub-zero ...

Forbes contributors publish independent expert analyses and insights. Brad Moon covers audio gear, Apple products and consumer tech. This article is more than 7 years old. One of the great little ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." For times when your power goes out unexpectedly, an emergency repair arises after sundown, or a project ...

If the flashlight won't work on your iPhone, you can usually troubleshoot the issue in a matter of minutes and get your trusty light shining again. A nearly exhausted battery can prevent an iPhone's ...

Most commercial LED flashlightsuse three AAA or AA batteriesin series that produce 4.5V. The batteriesthen drive four white LEDs that connectin parallel. These LEDs can workat voltages as low as 2.7V ...