We know that laptop batteries don’t last forever, but sometimes it’s hard to tell whether your battery is actually dying or whether you’re just imagining bad battery life. Here’s how to keep up with your MacBook battery’s health without extra software.
Reader haxorknight explains that your battery’s health information is readily available from System Profiler:
If you own a MacBook, you can open the System Profiler by hitting More Info in “About this Mac.” Go down to the “Power” section and you can keep track of the battery’s health and cycle count.
I think for the Macbook Pros the cycle where the battery is supposed to lose it’s longevity is about 800.
In the screenshot above, the battery health is listed as normal and the number of cycles is only in the 200s, so we can assume this is a healthy battery. If it weren’t, it will say something like “Check Battery” instead of “Normal”.