Sold separately.
 Up to 13.5 hours of video playback. Testing conducted by Microsoft in April 2017 using preproduction Intel Core i5, 256GB, 8GB RAM device. Testing consisted of full battery discharge during video playback. All settings were default except: Wi-Fi was associated with a network and Auto-Brightness disabled. Battery life varies significantly with settings, usage and other factors.
Offer valid from October 2, 2018 to September 30, 2019, while supplies last. Available only in Microsoft retail and online store in United States and Canada. Valid with proof of purchase of select Surface Pro devices. Not valid on prior orders or purchases; cannot be transferred or otherwise redeemed for cash or coupon code(s). May not be combinable with other offers. Refunds will take into account the discount. Price discount does not include taxes, shipping or other fees. Void where prohibited or restricted by law. Microsoft reserves the right to modify or discontinue offers at any time. Limit of 5 offers per customer, in same transaction. Other exclusions and limits may apply.