uNu Enerpak 5,000mAh Battery Pack for iPhone 4/4S/5 for $29 + free shipping
BuyDig via eBay offers the uNu Enerpak 5,000mAh USB Battery Pack for iPhone 4/4S/5 for $29 with free shipping. That's the lowest total price we could find by $21. The pack is compatible with most smartphones and USB devices. Deal ends January 6 at 10:59 am ET.