iFrogz Gofuel Universal External Battery Charger for Smartphones and Tablets (13,000mAh) -  Black/Grey Rechargeable: A powerful 13000mAh lithium ion battery, charges up to 6 smartphones or 2 tablets at the same time. Convenient: Users can charge a smartphone and tablet at once using its dual USB charging ports. Compact: Its low-profile design makes it super portable. Easy: Four LEDs clearly show remaining power. Stylish: Available in multiple trendy colors and designs.