As one of its daily deals, THAT Daily Deal offers the Mophie Juice Pack Plus Battery Case for iPhone 4, model no. 1160JPPLP4, in five colors (Black pictured) for $39.99 plus $4.99 for shipping. It's the lowest total price we could find by $42. This 2,000mAh battery pack provides up to 8 hours of talk time in 3G or up to 16 hours in 2G. It features a hard shell case, rubberized bumper, and LED indicators of battery strength. Deal ends today.