(credit: Apple)

If you need to invest in a battery pack to help your iPhone survive the whole day, now you'll have an Apple-made option to choose from. Apple unveiled its first official battery pack for the iPhone 6 and 6S, dubbed the Smart Battery Case, by putting it up for sale on its website.

The $99 Smart Battery Case comes in white and charcoal gray and Apple claims it will add up to 25 hours of talk time to the iPhones, up to 18 hours of Internet use on LTE, and up to 20 hours of video playback. Photos on Apple's website show the iPhone slipping into the case rather than the case separating into multiple pieces. Apple describes it as a "soft elastomer hinge design," which just means the case is made of silicone so it's flexible enough for you to pull down an edge and slip your smartphone inside. The interior has a microfiber lining.

(credit: Apple)

Clearly noticeable is the case's battery bump, sitting in the middle of the pack on back of the iPhone. Other than the bump, the Smart Battery Case looks quite similar to Apple's regular iPhone cases. Many competing cases from companies like Mophie extend the length and width of the entire case in order to hide the battery, which looks more symmetrical but also adds thickness and bulk to the phone. Apple clearly wanted to let as much of the iPhone's thin design shine through even with the necessary bump on the back.

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