Samsung ran a series of ads calling iPhone users “wall huggers,” and they were pretty annoying… mostly because they’re true. Apple’s iPhones do plenty of things very well, but it would be hard to find anyone who considers his or her iPhone a class-leader when it comes to battery life.

So, you can either switch to another phone with better battery life, or you can keep your precious iPhone and snag a 5,600 mAh AmazonBasics Portable Power Bank on sale right now for under $20 on Amazon.

Amazon’s regular $24.99 price is more than fair for a nice compact portable charger with enough juice to fully charge an iPhone 6 more than three times. For a limited time, however, Amazon is knocking 20% off the device’s price, making it just $19.99 with free shipping.

Seriously, stop thinking about it and just get it.

5,600 mAh AmazonBasics Portable Power Bank, $19.99 with free Prime shipping