i am not at the moment but thinking about it. the battery looks promising and they have the biggest one (18000 mAh) in the market.
No it's not:
Anker® Astro Pro2 20000mAh Ultra-High Capacity Multi-Voltage (5V 12V 16V 19V) External Battery Backup Charger Power Pack for Tablets, Netbooks, Notebooks, Laptops and Smart Phones -- Compatible with HP, Dell, Acer, Asus, Toshiba Notebooks, Google Glass, Nexus Tablets, iPads, iPhone 5S, 5C, 5, 4S (Apple adapters not included), Samsung Galaxy S4, S3, Note 2 and More
http://amzn.com/B00B45EOYS
Poweradd LE030 32000mAh Monster Capacity Multi-Voltage (5V 9V 12V 16V 19V 20V) Portable Charger External Battery Backup Power Bank with Smart LCD Digital Display for Tablet PC, Netbooks, Notebooks, Laptops, Smart Phones -- Compatible with Acer, Asus, Dell, HP, Lenovo, Sony, Toshiba Notebooks, Google Nexus Tablets, iPads, iPhones(Apple Adapters not included) Samsung Galaxy Phones and More Other Devices
http://amzn.com/B00DN0KBXU
Intocircuit® Power Castle PC26000 26000mAh External Battery Pack/High Capacity Power Bank for Laptops Notebooks Tablets Smart Phones: HP, Dell, Toshiba, Acer, Samsung, Sony, Gateway Laptops; Google Nexus 7 Tablets; Apple iPad mini, iPhone 5 (Lightning Cable not Provided), iPad, iPod; Samsung Galaxy S3 S4, Galaxy Note 2; HTC Sensation, One X V One X V S, EVO 4G, Thunderbolt; Nokia Lumia 920 900 N9; Motorola Razr Atrix Droid; LG Optimus (USB output: 5V, 2.1A; DC output: 12V, 1-4A/16V, 1-3.5A/19V, 1-3A) [10 Connectors for Laptops, 10 Connectors for Phones and Tablets, AC Adapter Included]
http://amzn.com/B00BB5VQCE