Amazon currently has the AUKEY 30,000mAh USB-C PD Battery Pack on sale for just $56. That is when you use the promo code AUKEYPY7 at checkout, which takes $20 off of its regular price and really makes this a rather sweet deal, for a battery pack with a ton of capacity.
So this battery pack from AUKEY is pretty big and bulky, of course, that is to be expected, considering this battery pack does have 30,000mAh capacity. But it is going to be able to fully recharge your smartphone around 10 times, depending on the size of its battery. Now it also has USB-C PD here which means that it is going to be able to do both input and output, but on top of that, it will also be able to charge larger devices like a Nintendo Switch or a Macbook Pro, or any other laptop that uses USB-C. Which is a nice addition here. Otherwise, you're looking at two regular USB-A ports here, with one sporting Quick Charge 3.0. So if you are looking to quickly charge up your smartphone while you're on the go, this is a good option, especially if you have a new smartphone. This is a great battery pack to pick up, particularly if you are one that is always on the road and need to charge up your phone pretty quickly.
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.