EC Technology has an amazing deal on their 2nd generation Deluxe battery pack. It's a 22,400mAh battery pack and it's on sale for just $37 right now. It's normal price is around $90, so definitely a good deal. It also has 3 USB ports so you can charge up your smartphone, laptop, and possibly the new Chromebook Pixel? It's got enough juice to last a while. EC Technology even threw in a nice flashlight for you to use as well. You can grab it from the link below.
EC Technology® 2nd Gen Deluxe 22400mAh Ultra High Capacity 3 USB Output External Battery With 3-modes LED Flashlight Portable Power Bank Charger For iPhone 6 Plus 5S 5C 5 4S 4, iPad Air, iPad mini, Galaxy S5 S4 S3, Note 4 3, Nexus, HTC One, Most other Phones and Tablets - Black & Red