All4Cellular offers the refurbished Mophie Juice Pack Pro Charging Case for iPhone 4 / 4S in Black, model no. 2120_JPPR-IP4-BLK, for $74.95. Coupon code "SAVE20" cuts it to $59.96. With free shipping, that's $67 under the lowest total price we could find for a new unit, although we saw a refurb for $8 less in January. This 2,500mAh battery pack features up to 150% more usage time, resistance to shock, rain, vibration, sand, dust, and impact, belt clip, integrated screen protector, and more. Deal ends April 16.

Note: A 90-day All4Cellular warranty applies.