Have you ever experienced that your phone’s battery dies when you need it the most? Maybe on a hiking trip when you want to take a beautiful photo. Maybe when you’re trying to find your friends in a festival full of people. It’s usually at the worst possible moment. With this portable USB charger, you can recharge your phone on-the-go. It uses standard AA batteries that you can buy in any supermarket, or you can modify it to use other battery types, solar power or even power adapters not really meant for your phone. The charger works like a 500 mA iPhone charger and will work with most modern phones.