iPhone battery cases are great, especially when you’re running a battery hog of an iOS app, but the added bulk can be annoying for everyday use. But what if there was a way to keep your battery case off of your iPhone when you don’t need it while still keeping your phone protected from damage? With the Energi Sliding Power Case, you can do just that.

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The Energi Sliding Power Case features a two-piece design—an internal snap-on shell and a slide-on 2500mAh battery pack. The snap-on shell stays on your iPhone at all times, providing protection from damage due to drops and scratches. On the other hand, the slide-on battery pack fits over the snap-on shell, and only needs to be attached when your phone needs some extra juice. According to its makers, the battery will provide you with up to 9 hours more talk time. Not bad if true.

You can purchase your Energi Sliding Power Case here for $99 in one of three colors—red, blue, or green.