Amazon has discounted Anker's very popular PowerCore Elite 20000 Battery Pack, bringing the price down to just $44, when you use the promo code ANKERPC3 at checkout. That's a great deal for this battery pack, which is normally priced at $55.99, so you're getting about $12 off of the regular price. Definitely worth picking up at this price.
The Anker PowerCore Elite 20000 is a pretty interesting battery pack. Firstly because it actually has two inputs, so you can charge it up pretty quickly, which is really nice to see here. The two inputs are still micro USB, but it allows you to charge this somewhat large capacity battery pack, about twice as fast. And that's really nice to see. There are three regular sized USB ports here as well, for charging up other devices. There's no Quick Charge 3.0 support here, but instead, Anker has its PowerIQ Technology included. With PowerIQ, users will be able to charge just about any device quickly. Whether that's a smartphone, tablet or something else. PowerIQ is able to talk to the device and see how much current it can take without damaging the device. So you get quick charging, but safely. That's really nice to have, especially when you're on the go - so you don't need to hunt down an outlet and hug the wall at the airport.
This item is also eligible for Amazon Prime's free shipping. Which includes free two-day shipping, and pretty cheap (usually $3.99) next-day shipping if you need it extra fast. If you are not an Amazon Prime member yet, you can sign up for a free trial of Amazon Prime. You'll get 30 days free (if you're a student, you get 6 months), and then it's $119/year (or $59/year for students). Prime members do get a whole lot more than just free shipping though, so be sure to check out the full benefits.