Amazon has the Poweradd™ Pilot 10000mAh Dual USB Portable Charger Backup Battery Pack for only $21.99 (was $69.99) & FREE Shipping with Amazon Prime or orders over $35.

This is from an IHTM reader:
I just purchased this and I love it. It charged my Galaxy Note 4 in two hours, about the same time it takes to charge with the wall charger. It has enough mAH to charge my phone a total of 3 times before I need to charge it.  The Battery pack never got hot to touch neither did my phone. I am very happy with this product.

I don’t know about your cell phone but it seems my day last longer than my battery.  We are getting this portable charger, it has dual USB charging capability so that if Tiff needs to charge her phone at the same time we are in luck.  It has 10000 MAH and can recharge our phones/tablets/ ipads etc multiple times.

• Aviation Aluminum body design to ensure lightweight and durability. Compact size makes it easy to carry and fits easily into pocket.
• High capacity of 10000mAh, use a 2.1A adapter for fastest charging time, twice faster than general 1A input.
• Dual USB (1.0A + 2.1A) for charging 2 devices simultaneously. Unique blue 2.1A output design, more easy to recognize.
• Constructed with A+ Li-Polymer battery cells and build-in microchips to ensure safety use and long lifespan. High efficiency rate enable it to charge an iPhone five times, a large capacity phone like Glaxy S4 three times, or an iPad almost twice.
• Package contents: Poweradd™ Pilot 2GS external battery, micro USB cable, user manual. (Apple adapters not included)

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