New Trent Easypak 7000mAh Portable Triple USB Port External Battery Charger/Power Pack for Smartphones, Tablets and more (w/built-in USB cable)
I originally purchased IMP70D for my wife.  Taking train to the city mixed with lousy coverage in buildings always drained her cell phone (HTC EVO 3D) battery by late afternoon.  She kept the battery pack in her purse to charge her phone and at times also her tablet (Samsung Galaxy Tab) with no complaints.<br /><br />When we went on vacation, we took the battery pack with us on our 16 hour flight.  During the flight we charged Samsung Galaxy Tab 7 and HP Touchpad to keep us entertained throughout the 15-16 