This External Lithium Rechargeable Battery Pack can power and charge Microsoft Surface Pro 3 or Surface Pro 4 laptop computers. It can provide extra 2 ~ 3 times running time of your current internal battery running time. 1.This battery has 2 output ports: This battery has a 5V USB port that can be used to power or charge cell phones, iPhones, iPads, MP3/MP4 players or other devices that can be charged from a USB port (USB power cable not included). Regular output port can supply 12V DC power by using the 12V output cable included. 2. High Capacity and Long Running Time: High Capacity: 99 Watt-hour capacity (or 27,000 mAh if rated like other external batteries on market). Its rated capacity is equivalent to a 12V 8Ah lead acid battery. However, this lithium battery can be fully discharged while most lead acid battery cannot be fully discharged. This battery actual running time per charge may be close to a 12V 10Ah ~ 12Ah lead acid battery. 3. This battery has its own charger and can be charged from 100V ~ 240V 50Hz/60Hz AC power source with the battery's AC charger: Specifications: It has 99Watt-Hour (or 27,000mAh) capacity. Special connector tip work for Microsoft Surface Pro 3 and Surface Pro 4 computers that need 12V DC input voltage. Built-in USB Power Port for Charging or Powering iPad, PDA's, Cell Phones, Media Players Its compact size can easily fit into a laptop/notebook carry bag. Maximum Output: 5A @ 12V USB Port Maximum Output: 2.1A Capacity: 99 Wh Weighs only 1.8 Lbs. Compact size 8.5 x 5.5 x 0.9 inches Excellent security and reliability High efficiency power conversion No Memory effect
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