RAVPower 10400mAh 3.5A Portable Charger External Battery Pack Power Bank with iSmart Technology

Quality Charging: 3.5A output lets you quickly charge both tablets and smartphones at the same time; while 2A input means the portable charger takes half the time to charge itself compared to traditional 1A chargers
Exclusive iSmart Technology: Detects the optimal charging current your device needs then supplies it (i.e. delivers a 1A charging out for phones that have 1A charging input)
Incredible Capacity: A huge 10400 mAh capacity means your iPhone 6 can charge three to four times, a Galaxy S6 2.5 times, or an iPad Mini once before you need to recharge the power bank
Unique Design: Smooth, ebony varnish allows you to power up in style, while 4 status LEDs keep you informed of remaining battery capacity
Protection Guarantee: This portable charger will automatically shut down if a short circuit or overload output occurred while unit is charging. Can be charged over 500 times without losing Lithium-ion battery effectiveness