For its newsletter subscribers, newegg.com offers the Energizer PowerSleeve for iPhone 4, model no. AP1201, for $59.99. Coupon code “EMCZNYV55″ knocks it to $29.99. With free shipping, that’s the lowest total price we could find by $29. This non-slip and fingerprint-resistant silicone case charges an iPhone via its built-in rechargeable 1500 mAh battery. It detects when the phone is low on battery life, then automatically charges it. Coupon ends December 13.
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