BATTERY TEST 4:00 pm test start Settings: Starting at 100% charge, 35% locked screen brightness (no auto or dimming), keyboard backlight off, power profile "sleep: never." Bluetooth off. Set global volume to 6 because I wanted to listen to other things. Test: Constant streaming of Youtube video in Metro IE11 snapped to desktop with Notepad and Task Manager open in the desktop (total of 3 app processes in use). IE hovered around 130-150MB memory usage. To avoid playlist caching (just in case, no idea if it does), I started a new playlist whenever one ended. That would be 171 episodes of The Daily Show and dozens of 2Cellos/Apocalyptica music videos, in case anyone is curious p). This wifi test isn't as constant as a torrent test. 6% warning at 12:29 am. 4% warning at 12:37 am. Shut down at 12:40 am sharp. Total run time: 8 hours 40 minutes Comments: 35%-40% is my screen brightness average. I usually turn it down a bit for video anyway because I dim ambient lighting in that scenario, and I rarely ever get to 50% or higher in regular use (hurts my eyes, hsssss!). Feel free to add your own tests/scenarios here--the more detail the better. Edit to add: This test was the first time I ran my Surface 2's battery down to the shutdown warnings; I never even did that for my RT. Otherwise, my S2 had gone through several charge/recharge cycles since I got it, but always at partial capacity.