The Moshi IonGo 5K Duo Proves To Be A Capable Everyday Mobile Charger. In this fast-paced, tech-dependent modern day, a small but powerful mobile charger is one of the most important things to have. If you leave your house for more than a few hours and your phone dies, you lose access to chauffeur driving services, maps, food location/delivery, calling, texting, and basically all methods of communication unless you happen to stumble upon one of the few remaining pay phones. So in short, everybody needs a mobile external charger...