The Surgit iPhone 7 Battery Case or the iPhone 7 Plus Battery Case both drop from $49.99 to $29.99 to $17.99 when you apply our exclusive code BDCASE12 in your cart at TechRabbit. Plus, the shipping is free, which makes this the best price we could find for either case by at least $7 and as much as $18 depending on the color. These cases offer both protection and an extra 3100 mAh of power that can add a total of 13 hours of life to your iPhone. Note: The code does not work on the Black iPhone 7 Plus case. There is no sales tax (except NJ).