Groupon again offers the MOTA Extended Battery Case for iPhone 5 in Black or Silver for $34.99 with free shipping. That's $58 below what MOTA charges direct and tied with our April mention for the lowest total price we've seen. This low-profile case features a built-in 2,000mAh battery which is purported to double the life of the phone. Deal ends June 17 at 1 am ET.