Mophie (http://www.mophie.com) has announced the the juice pack plus, an US$99.95 enhanced capacity iPhone 4 battery case that will purportedly more than double the time iPhone users have to rock, talk and surf.

The plus is mophie’s second rechargeable external battery case designed for the iPhone 4, and has a 2,000 mAh battery capacity, the largest of any juice pack case produced to date. In keeping with mophie’s award-winning juice pack design, the juice pack plus is ultra-thin and light-weight, providing protection and now even more power for the iPhone 4 while adding only 1mm of thickness when compared to the original juice pack air design, says Susan Schedel, vice president of sales and marketing for mophie.

The juice pack plus boasts a 2,000 mAh charging capacity, offering iPhone 4 power users with more than double the battery life on-the-go. It features enhanced design elements including a dual injected rubber grip for extra hold, says Schedel.