One of Anker's newer power banks, the PowerCore 15600, is currently available on Amazon for just $25 with a coupon code. That's a pretty decent price for a power bank with 15,600mAh of juice. It features two USB ports, as well as a micro USB port for charging up the battery pack. Both ports do support 2.4A of power, so you will be able to charge your devices pretty quickly. Additionally, it uses PowerIQ Technology to send as much juice to your smartphone or tablet as it can handle. You can grab the Anker PowerCore 15600 Power Bank from the link down below.
Anker PowerCore 15600 - Super High Capacity 15600mAh Portable Phone Charger - $24.99 with code RGNUEBLC