My macbook pro 15 inch retina 2.3 ghz i7 laptop started at 84 percent battery remaining but it only says it has 3 hours remaining. As I continue to use it however, it goes up slightly. As i type this it now has 4:50 remaining, and it is now at 81 percent, and now 80 percent and 5 hours and 30 remaining. Yesterday, my friend was using my macbook pro for about 40 minutes and he was a little rough with it and was balancing it hard on his knees and picked it up with one hand and it looked like it kind of bent hard for like 4 or 5 seconds. and he leaned on it. I got very upset. but do you think this ruined the battery? Why did my battery start at 84 percent, and say only 3 hours, then as it went down to 80 it now says 5:40?