This is my testing setup: - Surface Pro running on Battery. - BatteryBar to monitor battery usage. - Same AVI Video File (xvid/ mp3). - Brightness at 30%. Video Players tested: Xbox Video - In Snapview Windows Media Player 12 (Default Windows Codecs) VLC MPC-HC My results show the following average discharge rates: Xbox Video - 9W (maybe less than this in full screen - I had to use snap view) Windows Media Player 12 - 9W VLC - 9W (a little bit more actually) MPC-HC -10.5W This might not seem like a lot but that extra 1.5 W gives an extra 30 minutes or so of viewing time.