Dell XPS 15 L502x: Now with Sandy Bridge - AnandTech :: Your Source for Hardware Analysis and News
Battery life in general isn’t class leading for the XPS 15, but it’s good enough to satisfy most mobile users. With the standard 6-cell/56Wh battery, you can get 3.5 hours of video viewing, up to 4.5 hours of web surfing (more if you’re on simple web sites), and nearly six hours of idle battery life. Buy the larger battery and you’re looking at 8.5 hours idle, over 7 hours of Internet surfing, and nearly six hours of video playback. The relative performance of the two batteries also scales almost perfectly with cell count and capacity—the 9-cell lasts 52 to 63% longer than the 6-cell.