Testing conducted by Apple in October 2013 using preproduction 2.3GHz quad-core Intel Core i7–based 15-inch MacBook Pro units, preproduction 2.0GHz quad-core Intel Core i7–based 15-inch MacBook Pro units and preproduction 2.6GHz dual-core Intel Core i5–based 13-inch MacBook Pro units. The wireless web test measures battery life by wirelessly browsing 25 popular websites with display brightness set to 12 clicks from the bottom, or 75 per cent. The HD movie playback test measures battery life by playing back HD 720p content with display brightness set to 12 clicks from the bottom, or 75 per cent. The standby test measures battery life by allowing a system, connected to a wireless network, to enter standby mode with Safari and Mail applications launched and all system settings left at default. Battery life varies by use and configuration. See
Apple - Batteries for more information.