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Amazon [amazon.com] has this Selectec 24000mAh Ultra High Capacity Portable Charger Backup Battery on sale for $ 27.99. Apply coupon code SELECT14 to drop the price to $ 17.99.Shipping is free.[list][*]Equipped with dual smart identify USB output ports(5V 2.1A / 5V 1A)[*]5 Security systems: IC Protection for over-charging, over-discharging, over-voltage, over-current and short-circuit. Safety guarantee for your devices.