There is NO normal. It depends on what apps you're using and how you're using them. If you spend some time looking around the forum you may run into some tips that will extend your battery. I get 5 hours minim but I also normally run at 35% brightness.I only get about 3-4 hours on 50% brightness with Bluetooth off, is this normal?
I bought it about 3 months agoNo. I get around 8-9 hours with my MS Office usage.
When did you buy the surface?