In terms of battery life, when you switch to Stamina mode, the power profile changes to 'balanced' and the integrated Intel HD graphics are used. In our battery rundown test, in which we loop an Xvid-encoded video, Stamina mode gave the laptop a life of 6hr 5min away from an outlet, which is a brilliant result. If you weren't watching videos all day and wanted to get some work done, you could realistically get a whole work day out of the battery. A second battery can be added to the VAIO SB Series (even while it's running), which will well and truly supply you all day battery life, but of course, add a little more bulk to the laptop. When we switched to Speed mode for our standard battery test, in which we disable power profiles, enable Wi-Fi, maximise screen brightness and loop the same Xvid-encoded video, the battery lasted a more modest 3hr 19min, which is still a great result when compared to other 13in laptops we've seen, such as the [URL="http://www.goodgearguide.com.au/review/notebooks/samsung/q330-js03au/362206"]Samsung Q330[/URL].
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