Apple MacBook (13-inch, Late 2007) - Manual (Page 27)

Chapter 2 Life with Your MacBook 27
Using the MacBook Battery
When the MagSafe power adapter is not connected, your MacBook draws power from
its battery. The length of time that you can run your MacBook varies, depending on the
applications you use and the external devices connected to your MacBook. Turning off
features such as AirPort Extreme or Bluetooth ® wireless technology can help conserve
battery charge.
If the battery runs low while you are working, attach your power adapter and let the
battery recharge. To replace a low battery with a charged one when your computer
isn’t connected to a power adapter, shut down your computer.
You can determine the charge left in the battery by looking at the battery level
indicator lights on the battery itself. Press the button next to the lights, and the lights
glow briefly to show how much charge is left in the battery. You can check the charge
with the battery in or out of the MacBook.
Important: If only one indicator light is on, very little charge is left. If no lights are on,
the battery is completely drained and the MacBook won’t 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 page 35).