Battery has high health, but gets short battery life?
I have a MacBook Pro in my house that has experienced dramatically decreasing battery life. Most of the time, I see the same behaviour with computers that have 300 - 500 + cycles, and their battery health shows up as 80% or lower. This MacBook Pro, however, has had 250 charge cycles and is at a 94% health according to coconutbattery. This means that it is at a max capacity of 6113 mAh, compared to its normal 6500 mAh. The strange thing is, leaving it on overnight it can loose 20%+ battery charge, and you can only get about 1:30 run time when idle, even though nothing is running and there is never a process running over 1-2% cpu (CPU spiked at 4% usage when I monitored it through a 100% to 0% battery discharge). I just find this odd with these stats and this performance. Given that is is a 4 year old computer, the battery specs still seem to be decent. I was wondering if anyone know of some sort of background application or something, that wont show up in Activity Monitor, that has the capability to slow down battery life. The computer has also been gradually slowing down, even though it has 8 GB of ram and 400+ GB of space free on the hard drive. I haven't tried replacing the battery yet, because this one still seems like it "should" have some life in it, it just isn't acting like that. As a note, it has never been dropped or had water damage, it has been lightly used for the past 4 years for web browsing and iWork, but never anything heavy. It has stayed indoors and has never been left in a hot car or in direct sunlight. If anyone knows something I can do to get some more battery life back, if there even is anything, I would be happy to hear what you have to say. As I typed this out, the computer battery life dropped from 82% to 63%, and only Safari was running. (it is also in integrated graphics right now, which makes it seem really weird that this is happening, could both the integrated AND dedicated be running at the same time somehow?)
Thanks for the Help