You can use iWalk Tripus 8000 Universal Battery to charge most tablets and smartphones. Its internal circuit design is specifically designed to safeguard your connected device from damage caused due to overcharging or short circuits. Moreover, iWalk Tripus 8000 Universal Battery features a unique compact design that lets you carry it around with ease.

8000mAh Rechargeable Li-polymer Battery
Built in USB cable, supports data transfer and sync media
Built in output and input cables with pass-through technology. Pass through supports charging iWalk Tripus 8000 Universal Battery and connected device simultaneously
DC-In at 5 V/2.4 A
DC-Out, all ports single output - 0.5 A - 2.4 A

What Comes in the Box
1 X iWalk Tripus 8000 Universal Battery