Anker Astro E1 5200mAh

Exclusive PowerIQ Technology: Detects your device to deliver its fastest possible charge speed up to 2 amps (four times faster than a computer USB port). Add almost two full charges to an iPhone 7 or 6s or at least one full charge to a 7 Plus, Galaxy S7, Nexus 5 or other smartphone. Or almost a 70% charge to an iPad mini 3. Incredibly Compact: The size of a small candy bar, it fits perfectly in your pocket. Recharges in 5 hours with a 1A adapter (not included) and the included Micro USB cable.