mark22
Watching videos (flashplayer) increases CPU use. Increased CPU use means the computer is working harder, which decreases battery time.
Keep an eye on time remaining. It will decrease quite a bit while watching a video. Now quit watching the video. After a few minutes you should see your time remaining jump back up a bit. Just the way it is.
Apple's battery time is the MOST it could possibly get. However, running any applications will decrease this time. Any application that is CPU intensive will lower the battery time even more.
Thanks for your reply, it sounds stupid but im new on this forum and this is my first MBP 15. I have a IPAD 64 GB and the battery is much better, can you tell me why the IPAD battery works so much better??