Apple just released a new iPhone case called the Smart Battery Case. Apple says it will improve the battery life up to 25 hours. There have been third party vendors, such as Mophie, that have made cases like this for years. However, this is the first time Apple released their own official product.
According to Apple, the new case will provide over 25 hours of talk time, 18 hours of internet use, and over 20 hours of video playback.
The case is available in black and white and only work on the iPhone 6 and 6S. The case costs $99.