There are about a million battery cases out there for Apple’s iPhone line, ranging dramatically in price, design, and features. Here’s one you can get for just $21 that’ll double your iPhone’s battery life, for example. Of course, nothing will ever integrate with an Apple device as well as another Apple device, which is one of the reasons so many iPhone users opt for the Apple iPhone 7 Smart Battery Case. This sleek case adds plenty of juice to your phone, and it also has a Lightning port so you don’t need to carry a separate cable. It also has a very cool feature that displays the remaining charge of your case on the iPhone itself — no third-party case can do that.

Apple’s Smart Battery Case is a bit pricey, but it’s being discounted right now on Amazon in both black and white. The red case is unfortunately still full price.

Here are some highlights from the product page:

  • iPhone 7 Smart Battery Case gives you increased talk time, up to 26 hours, more Internet use, up to 22 hours on LTE, and more video playback, up to 24 hours. A single Lightning cable allows you to charge your iPhone 7 and the Smart Battery Case at the same time.
  • With the Smart Battery case on, the intelligent battery status is displayed on the iPhone lock screen, so you know exactly how much charge you have left. Battery status is also shown in Notification Center.
  • The Lightning connector pass through allows you to connect Lightning accessories while the case is on your iPhone.

Follow @BGRDeals on Twitter to keep up with the latest and greatest deals we find around the web.

BGR Deals content is independent of Editorial and Advertising, and BGR may receive a commission on purchases made through our posts.