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Is the battery health indicator accurate?

MacBook Pro - MacRumors Forums - forums.macrumors.com
I have a MBP 13-inch Late 2011, OS X 10.8.2. iStatMenus, CoconutBattery all have a battery health indicator stating the current capacity. But is it accurate? Does it merely count the health based on the number of cycles or does it actually gauge the health (and true capacity) of the battery? I understand it asks the battery driver for the capacity of the battery. There are other reasons other than the number of cycles a battery undergoes which can cause it to deteriorate, including heat. I live in a hot country, and I thus wonder whether the battery health it states is accurate. I say this because I now only get about 5 hours of runtime not doing much with my MacBook Pro, and sometimes the projected battery life can dip to just above one hour. According to Anandtech, even downloading stuff, surfing the web and playing a video simultaneously still allows the battery to last 3.6 hours. How is this possible? Thank you!

 


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