Hey. I have a rMBP mid-2012 and i am thinking that the battery is ending sooner than it has to be. How can i test my battery? I don't mean the battery cycle. I mean, how can i test my on-screen time without holding a chronometer and using it. Is there an application or something like that? Thank you. Specs if needed; 15" i7 256 SSD 8GB RAM Fair solving for problem: i found out that i usually use the graphic switcher (in energy section on settings) off and that means a lot of power drain i think, now i use with it on and using auto brightness and getting at least 1.5x battery performance.