At just over 3.6 lbs. the all new VAIO S Series laptop offers a step up to the performance and portability you demand. From its seamless contours to advanced technology that offers up to 15 hours of combined battery life (with optional extended battery) the S combines bold design and mobile performance in a way only Sony can.All Day MobilityLeveraging the latest innovations in lithium polymer technology, the battery of the S Series is integrated into the PC and conforms to the contours of the chassis offering a thinner battery profile while still supplying up to 8 hours of battery life. This concept even extends to the all-new large capacity sheet battery and leaves behind the traditional bulky and protruding long-life batteries of the past. Attaching directly to the standard capacity battery and by working in tandem with it, you'll enjoy up to 15 hours of total combined battery life (with optional extended battery) - helping to keep you unplugged longer.