It's been only 4 days since I've got my New MBP 13". Cycle count is 4. Monitor Brightness around middle. And only lasts me 2 Hours and 30 min after fully charging? All I did was playing with Photobooth for 5 min, turned all the application off except Safari, bluetooth was off, backlight of keyboard off, and I wasn't downloading nor watching any video just browsing through webs. I checked Activity Monitor to see if there is any Activities that draining the power, and nothing. Now it's showing 2hours left and it's 78% of battery. Is there something wrong with my battery? Should I take it to Apple Store?