Get Upto $20 Discount On Mophie Portable Charger At Bestbuy. Give the smartphone or tablet the charge it needs to get through the day with this Mophie power reserve 2X. An LED indicator light displays the current battery level, and the digital power management system delivers the appropriate charge to each of the devices. With its compact size, this Mophie power reserve 2X is conveniently portable. It has up to 2.1-amp output which enables rapid charging.