Have you ever seen this button On the same side as the USB ports look like 8 LED lights? What does it do?
I believe it tells you how full the battery is, on older macbooks it's on the bottom.
" Press it and it'll tell you how much power is in the battery. You can do this without the machine being on, for a quick check."
1 LED means the battery is 10 percent and above
2 LEDs means the battery is 20 percent and above, ect.
For the example, my battery indicator show my battery is 21%. When I press the button, the lights will turn on (2 LEDs)
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