HP Pavilion dv7-4278nr Entertainment Notebook PC - Manual (Page 49)

Connecting the AC adapter
WARNING! To reduce the risk of electric shock or damage to the equipment:
Connect the power cord into an AC outlet that is easily accessible at all times.
Disconnect power from the computer by disconnecting the power cord from the AC outlet (not by
disconnecting the power cord from the computer).
If the power cord has a 3-pin connector, connect the cord into a grounded (earthed) 3-pin outlet. Do not
disable the power cord grounding pin, for example, by attaching a 2-pin adapter. The grounding pin is
an important safety feature.
To connect the computer to external AC power:
1. Connect the AC adapter to the power connector (1)on the computer.
2. Connect the power cord to the AC adapter (2).
3. Connect the other end of the power cord to an AC outlet (3).
Using battery power
When a charged battery is in the computer and the computer is not connected to external power, the
computer runs on battery power. When the computer is connected to external AC power, the computer
runs on AC power.
If the computer contains a charged battery and is running on external AC power supplied through the
AC adapter, the computer switches to battery power if the AC adapter is disconnected from the
computer.
NOTE: The display brightness is decreased to save battery life when you disconnect AC power. To
increase display brightness, press the Increase Screen Brightness key or reconnect the AC adapter.
Keep a battery in the computer or in storage, depending on how you work. Keeping the battery in the
computer whenever the computer is connected to AC power charges the battery and also protects your
work in case of a power outage. However, a battery in the computer slowly discharges when the
computer is off and disconnected from external power.
WARNING! To reduce potential safety issues, use only the battery provided with the computer, a
replacement battery provided by HP, or a compatible battery purchased from HP.
Computer battery life varies, depending on power management settings, programs running on the
computer, display brightness, external devices connected to the computer, and other factors.
Using battery power 39