(Image credit: Zagg) 3. mophie Snap+ Juice Pack Mini The best portable charger for iPhone Specifications Capacity: 5,000 mAh Output Ports: 1x USB-C Max Speed: 7.5W Weight: 7.4 ounces Measurements: 5.16 x 4.09 x 1.02 inches Today's Best Deals View at Amazon (Black) View at Best Buy...