NeweggFlash offers the Lenmar Maven 3,000mAh Battery Powered Case for iPhone 6 in Matte Black, model no. BC6_B, for $29.99 with free shipping. That's $15 under our mention from last month and the lowest total price we could find by $15, although most merchants charge at least $60. It provides a 110% charge, effectively doubling the battery life of your device. Deal ends August 31.