AmazonOLD has the Patriot FUEL+ 9000mAh Ext. Battery Pack Sale Priced for $47.99 with Free Shipping. Great for travel or all-day use of tablets and phones. $80 at newegg.

• Powerful 9,000mAh battery that can charge almost any portable electronic device
• Dual-port charging capability allows for two electronics devices to be charged at the same time using a 2.5A and/or 1.0A port. The 2.5A port can efficiently charge tablets devices, while the 1A port can recharge most smartphones and other portable electronics
• Includes a 2-year warranty