Update: This sale has ended.

There's nothing worse than a dead phone. You can't Instagram your lunch, Waze your commute, or jam Spotify at the gym if your battery is empty. This is why you need a backup plan, like the Anker Astro E1 6700mAh High-Speed Portable Charger. It's on sale for $13.99 at Amazon right now. It typically sells for around $17, and has been priced as high as $22. Go with the black color since every other one will run you $20.

This power bank received 4.5 out of 5 stars based on 228 customer reviews. It's tiny -- the size of a candy bar, in fact -- and will charge your phone at least once depending on the device you have. Anker's exclusive PowerIQ technology will detect your device and charge your battery as quickly as possible.

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You'll get the battery pack, a micro USB cable, travel pouch, welcome guide, and an 18-month warranty. It's a good idea to keep a spare phone charging cable in the travel pouch as well. You can pick up an AmazonBasics Lightning Cable for $6.49! Micro USB users, you can use the included cable, but a 6-foot one will only cost you $5.99. If you use USB-C, here's one for $6.99.

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