Five Best Power Banks for Your Smartphones

Anker Astro E5

• Monster capacity (15000mAh) charges the iPhone almost 7 times, large-capacity phones like the Galaxy S4 4 times or almost a full charge to an iPad 3 / 4. In terms of power, this is the biggest, baddest battery in the Anker® mobile line.
• Super-fast charge output (5V / 3A total) through dual USB ports (5V / 2A and 5V / 1A) allow for simultaneous charging of your iPad, iPhone, Android, and more at high speed.
• Smooth, ebony varnish allows you to power up in style, while 4 status LEDs keep you informed of remaining capacity. Built-in flashlight for dark or low-light environments.
• Ultra-high density battery cells make this the world's most compact 15000mAh external battery. Use a 5V / 1.5A adapter (not included) for fastest charging (9-10 hours).
• Package contents: Anker® Astro E5 External Battery, Micro USB cable, travel pouch, instruction manual. 18-month hassle-free warranty. (Apple 30 pin and lightning, Samsung 30 pin adapter, not included)

• Heavy Duty 5V@2A-1A Dual USB External Battery Charger, charges 2 devices simultaneously. 2A output for iPad/Tablet and 1A output for iPhone/smartphones.
• Compatible with most Smartphone's (Apple, Samsung, HTC, Motorola, LG, Nokia, Blackberry, Sony, etc...) and 5V Tablets and compatible devices.
• No iPhone/iPad adapter or cable is included, but the iCarrier IMP120D is compatible with the original Apple Lightning/30-pin cables.
• AC wall charger is not included, but the iCarrier IMP120D can be recharged from any standard 5V/2A USB charge ports: computer USB ports and USB wall chargers.

• Feature a 5 volt, 2.1 amp out-put for charging iPads. The perfect supplemental power for iPads, tablets, and all your portable devices.
• Safe charge- Temperature and short circuit protection
• LED Light indicator - for smart LED's display battery and charging status

Xiaomi 10400 mAH

Features - 

• Aluminum alloy shell. Smooth, ebony varnish allows you to power up in style, while 4 status LEDs keep you informed of remaining capacity.
• Ultra-high density battery cells make this the world's most compact 10400mAh external battery. Use a 5V / 2A adapter (not included) for fastest charging (6-8 hours).
• Monster capacity (10400mAh) charges the iPhone almost 4.5 times, large-capacity phones like the Galaxy S4 3 times or almost a full charge to an iPad 3 / 4. In terms of power, this is the biggest, baddest battery.
• Super-fast charge output (5V / 2.1A total) through USB ports allow for charging of your iPad, iPhone, Android, and more at high speed.
• Package contents: XIAOMI/MIUI External Battery, Micro USB cable, travel pouch, instruction manual.

Mophie Juice Pack Powerstation

Features - 

• powerful 12000 mAh external battery
• charging output of up to 2.1 amps
• enough power to recharge your iPhone up to 2x
• four-light "invisible" LED status indicator
• powerstation handles the battery needs of any device including the iPad