Mophie is introducing a new battery pack for the iPhone 4 that’s housed inside an attractive, colorful case called the Juice Pack Plus, which delivers longer battery life and hard case protection for Apple’s smartphone. Although it has a larger capacity battery, the device is only slightly bigger than the Juice Pack Air for the iPhone by 1 mm and features a similar design with four LED light indicators as a power gauge level to alert users to how much juice is left. The battery is rated at 2,000mAh and will be available in black, cyan, magenta, and yellow for $100 with the black version available today. The design has a pass-through USB to micro USB connector for charging and synchronization so you don’t have to remove the iPhone from the Juice Pack Plus to connect to iTunes.