Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Dell Computer XPS 15 XPS15-6842sLV 15.6-Inch Laptop [Discontinued By Manufacturer]
Product description: The XPS 15 combines jaw-dropping resolution and true, vibrant color in a large 15.6" touch display. Its crisp, sharp detail and rich, true color is perfect for editing photos and graphic design. Stunning brightness and wide viewing angles make it easy to share your display.
Product feature: Intel Core i7-4702HQ (Haswell)(6M Cache, up to 3.2 GHz), 16GB DDR3L 1600MHz (8GBx2), 1TB 5400 rpm SATA Hard Drive + 32GB mSATA Solid State Drive, 15.6 inch LED Backlit Touch Display with Truelife and QHD+ resolution (3200 x 1800), Windows 8.1
Product price: $1,398.77
Product brand: Dell
Target attributes: Battery Life
Answer: attribute: battery life
value: None
source: None