As one of its daily deals, All4Cellular offers the refurbished Mophie 2,000mAh Juice Pack Air for iPhone 4 and 4S in four colors (White pictured) for $14.99 plus $2 for shipping. That's tied with our expired mention from five days ago and $43 under the lowest total price we could find for a new unit in any color elsewhere. This 2,000mAh battery pack provides up to an extra eight hours of talk time in 3G or up to 16 hours in 2G. Deal ends May 27 at 1 am ET.

A 90-day All4Cellular warranty applies.