Qi-infinity8482; Powerplant 49,800mah External Battery Pack/high Capacity Power Bank Charger for Laptops, Notebooks, Netbooks, Tablets and Smart Phones Not for the faint of heart! This is about 3 lbs of raw power. It can also jump-start your car (clamps included). Perfect for hiking, field trips or long drives. No need to call AAA, you can jumpstart your car and all your mobile devices. This monstrosity has ultra capacity of 49,800mAh. Provides 1 DC output for Laptop/Surface Pro and 2 USB ports for 5V USB-charged devices. Advanced Lithium Polymer super cells with &gt;500 recharge cycles. Note: Surface 3 cable is not included. If you need to purchase compatible cable please go to http://www.amazon.com/gp/product/B00PQUCE9O The smart LCD display provides battery capacity and regulate voltage settings. It will automatically shutdown when there is an overload to protect your device 12 months of worry free warranty. Wide range of laptop connectors, Surface Pro/Pro 2/RT/ RT2 adapter, Lenovo X1 carbon adapter with adjustable 5 voltage levels (9V/12V/16V/19V/20V) to charge most of the laptops