RAVPower is pretty well known for their external battery packs that they sell. They range from pretty small 3350mAh batteries on up to the 16,750mAh that's on sale today. This portable charger is actually part of Amazon's Gold Box of the Day, meaning that it's heavily discounted and today only. So the sale ends tonight at midnight PST. It's coming in at $24, which is actually a really good price for a battery pack of this capacity. It has two USB ports, with a total 4.5A output. One port is a 2.4A and the other is a 2.1A. No Quick Charge here, but with 2.4A power, you should still be able to charge your device pretty quickly. Additionally, RAVPower has their exclusive iSmart Technology, which allows your device to charge faster, and it automatically detects and then delivers the best charging current for any connected device. With its huge capacity, it can charge most smartphones around 5-6 times before needing a recharge.
Now in addition to RAVPower's sale here for their 16,750mAh battery pack, Anker is also selling a few of theirs on sale today. The Anker PowerCore 10,000 comes in at $17.99 with the promo code SND22GN6. In addition to that, their Astro E5 which is a 16,000mAh battery pack is going for $24.99 with the promo code 9XUMXC4S. Both of which are also great power banks to pick up today.