Add days of battery life to iOS devices with these powerful USB portable batteries from Lumsing and RAVPower - 9to5Mac
RAVPower Xtreme 23000mAh 3-Port Portable External Battery Charger with (9V/12V/16V/19V/20V Multi-Voltage 4.5A Max output) for Notebooks, Digital Cameras, iPhone, iPad and any other USB-Charged devices - Newegg.com
WALL Charger AC adapter for RP-PB14 RAVPower 23000mAh / 85Wh portable power Cord | eBay