Plemo Beanstalk 5200mAh External Portable Battery Pack and Emergency Charger with Integrated Cable for iPhone, Samsung Galaxy, HTC, Motorola, Droid, and Google Android smartphones and for Windows Phones and MP3 Players, Rose (Electronics)
Besides the really fun color (I green), this bean is handy. Small, it is still in my bag and follows me everywhere. It charges pretty quickly even though it does not itself have an astronomical autonomy. Still, given the price, it does more than work