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 works especially well in this variation where you ...

Learn how to make a simple lemon battery and use it as an emergency phone charger in this hands-on science experiment. Watch ...

We may earn a commission from links on this page. The most obvious solution to the problem is your car. Most modern cars have USB ports already baked in, and car batteries are pretty substantial power ...