If your job or hobbies require some heavy-duty iPhone fortification (think Otterbox), why not kill two birds with one stone and boost that paltry battery life as well? Mophie’s Juice Pack Pro fits onto both the 4 and 4S and packs a gigantic 2500 mAh cell (for comparative purposes the one in your iPhone 4/4S is approx 1500 mAh), boosting battery life tremendously. While it’s not entirely waterproof (resistant is the word), the case can take a beating, surpassing military standards for impact and dust protection.

Head over to Mophie or Amazon to find out more and to preorder – 130$.