Smaller than most of the keys in your pocket when folded away and weighing even less, the flexible Plan V opens to reveal a spot to plug in a 9-volt, as well as a microUSB port for connecting it ...

If you have trouble getting any of these parts to stay in place, use a scrap of aluminum foil to bridge any gaps. On a large phone with a fast-charging charger, the 9 volt battery may have trouble ...

The idea is, if your phone dies or gets too low on juice, you whip out the Plan V and attach it to a 9-volt battery, thus getting you around four hours additional talk time on a Galaxy S5 (as an ...

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 charger. Our own Lynna Lai tested it out. First, plug your phone ...

A USB car charger, which will serve as the core of your DIY battery pack.Pretty much any model will work for this project — mine came from a gas station for a couple of bucks. A 9-volt battery ...

The USB went from the car charger to the phone. The car charger has an input of 12v-24v and it regulates how much current goes into your phone. It allows only 5v to charge your phone.

A car phone charger. A 9-volt battery . An appropriate USB cable and any adapters necessary . A piece of conductive metal like a key or a paperclip . A twist tie . Plug the cable into the charger ...