You’ve managed to make it through the whole day without charging your phone (woo!). On your way home, you’re listening to your favorite tunes and messaging your friends, when suddenly, it dies. Now you’re stuck with a brick until you can make it home to an outlet.

Even then, you’re going to have to wait a few minutes for it to power back up so you can get back to what you were doing. Sometimes you wish you had just one more hour of power, and that is what the Credit Card Sized Cell Phone Charger is for. It’s only 1/4” thick, which means it’ll slide into your wallet, and will give you 25% battery life. It is compatible with most Android and Blackberry devices or traditional cell phones. It will connect via a one and a half inch long micro USB cord, and will charge itself in about two hours through a USB adapter. One of these will cost you about $30, and seems as though it would only be convenient if you are faced with this exact situation on a regular basis.