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Keep phones, tablets, cameras, and electronic devices powered on travel with the massive 20000mAh Mi Power Bank. Its premium lithium-ion polymer batteries supplied by Panasonic/LG have energy densities of up to 728Wh/L. Charge two devices at once with dual USB ports. The new Texas Instruments control chip in each 20000mAh Mi Power Bank supports rapid charging. Compatible with 5V/2A, 9V/2A, and 12V/1.5A charging, the power bank takes just 3 hours to charge 11000mAh and 7 hours to charge fully that's 44% faster than two 10000mAh Mi Power Banks combined. It maximizes time on the go so you spend less downtime on charging. At just 338g, the 20000mAh Mi Power Bank is 414g lighter than two 10000mAh Mi Power Banks combined. Enter a whole new level of high-speed charging with dual USB ports with up to 5.1V/3.6A output. Not only is the output significantly larger than ordinary chargers, 20000mAh Mi Power Bank also automatically adjusts the output level based on the connected device. It is compatible with smartphones and tablets from Mi 4, Apple, Samsung, HTC, Google and BlackBerry, as well as a variety of digital cameras and handheld gaming devices. Mi Power Bank's adopted USB smart-control and charging/discharging chips from Texas Instruments provide nine layers of circuit chip protection while enhancing efficiency.