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Chapter 3 Using Your MacBook 75
Important: If only one indicator light is on, very little charge is left. If no lights are
visible, the battery is completely drained and the computer will not start up unless the
power adapter is connected. Plug in the power adapter to let the battery recharge, or
replace the drained battery with a fully charged battery (see “Removing the Battery” on
page 80).
If the battery icon in the Finder menu bar is set to show the percentage of charge,
sometimes the battery won’t show a full 100 percent charge when the power adapter
is attached. This is normal behavior; battery life is maximized if charging is not
continuously cycled on and off when the battery’s charge capacity is between 95 and
100 percent. When the battery level eventually drops below 95 percent, it will charge
all the way up to 100 percent.
Battery
Battery LEDs
Button
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