HP Pavilion Dv1700 Notebook Pc Series Manual

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Hardware and Software Guide 3–17
Processor Performance Controls 
(Select
 Models Only)
Ä
CAUTION: To prevent overheating, do not obstruct vents. Use the 
computer only on a hard flat surface. Do not allow another hard 
surface, such as a printer, or a soft surface, such as pillows, thick rugs, 
or clothing, to block the airflow.
✎In some cases, a computer may operate at a higher speed on 
external power than on battery power. If the battery pack is the 
sole source of power and the battery power is extremely low, 
the computer may attempt to conserve power by reducing 
processor speed and graphics performance.
On select computer models, Windows XP enables you to manage 
processor performance controls by selecting a power scheme. The 
processing speed can be set
 for optimal performance or for 
optimal power conservation. 
						

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After a power scheme has been set, no other intervention is 
required to control the performance of your computer processor. 
The following table describes the processor performance on 
external and battery power for the available power schemes.
Power Scheme
Processor Performance 
While on External Power Processor Performance 
While on Battery Power 
Home/Office DeskAlways runs at the highest 
performance state.Performance state is 
determined based on 
CPU
 demand.
Portable/Laptop 
(default)*Performance state is 
determined based on 
CPU demand.Performance state is 
determined based on 
CPU
 demand.
PresentationPerformance state is 
determined based on 
CPU demand.Runs at the lowest possible 
performance state.
Always OnAlways runs at the highest 
performance state.Always runs at the highest 
performance state.
Minimal Power 
ManagementPerformance state is 
determined based on 
CPU demand.Performance state is 
determined based on 
CPU
 demand.
Max BatteryPerformance state is 
determined based on 
CPU demand.Runs at the lowest possible 
performance state.
*It is recommended that you use the Portable/Laptop power scheme. 
						

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Hardware and Software Guide 3–19
Battery Pack
ÅWARNING: To reduce potential safety issues, only the AC adapter 
provided with the computer, a replacement AC adapter provided by HP, 
or a compatible battery pack purchased as an accessory from HP 
should be used with the computer.
Inserting or Removing a Battery Pack
Inserting a Battery Pack
Although battery packs vary by model, the insertion procedure is 
the same for all models.
To insert a battery pack:
1. Turn the computer upside down on a flat surface.
2. Insert the battery pack into the battery bay 1 and rotate the 
battery pack 2 until it is seated. 
						

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Replacing a Battery Pack
Ä
CAUTION: To prevent loss of work when removing a battery pack that 
is the only power source, initiate hibernation or turn off the computer 
before removing the battery pack.
Removing a Battery Pack
Although battery packs vary by model, the removal procedure is 
the same for all models.
To remove a battery pack:
1. Turn the computer upside down with the battery bay 
facing
 you.
2. Slide the battery release latch 1 to release the battery pack.
3. Pivot the battery pack away from the computer 2, and 
remove it from the battery bay 3. 
						

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Hardware and Software Guide 3–21
Charging a Battery Pack
The battery pack charges when it is inserted into the computer 
and the computer is connected to external power. External power 
can be supplied through the following:
■AC adapter
■Optional expansion product 
■Optional power adapter
ÅWARNING: To reduce potential safety issues, only the AC adapter 
provided with the computer, a replacement AC adapter provided by HP, 
or a compatible battery pack purchased as an accessory from HP 
should be used with the computer.
To prolong battery life and optimize the accuracy of battery 
charge displays:
Å
WARNING: Do not charge the computer battery pack onboard 
aircraft. Charging the battery pack may damage aircraft electronic 
systems.
■If you are charging a new battery pack:
❏Charge the battery pack while the computer is connected 
to external power through the AC adapter. 
❏When you charge the battery pack, charge it fully. 
■If you are charging an in-use battery pack:
❏Allow the battery pack to discharge to about 10 percent 
of
 a full charge through normal use before charging it.
❏When you charge the battery pack, charge it fully.
A battery pack inserted in the computer charges whenever the 
computer is plugged into external power through an AC adapter 
or an optional power adapter, or docked in an optional expansion 
product.  
						

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A battery pack inserted in the computer charges whether the 
computer is off or in use, but the battery pack charges faster while 
the computer is off. Charging may be delayed if a battery pack is 
new, has been unused for 2 weeks or more, or is much warmer or 
cooler than room temperature. 
The battery light displays charge status:
■On: the battery pack is charging.
■Blinking: the battery pack has reached a low-battery 
condition and is not charging.
■Off: the battery pack is fully charged or not installed.
For information about determining the amount of charge in a 
battery pack, refer to the “
Monitoring the Battery Pack Charge” 
section next in this chapter.
Monitoring the Battery Pack Charge
Obtaining Accurate Charge Information
To increase the accuracy of battery charge information:
■Allow a battery pack to discharge to about 10 percent of a full 
charge through normal use before charging it.
■When you charge a battery pack, charge it fully. 
■If a battery pack has been unused for one month or more, 
calibrate the battery pack instead of simply charging it.
For information about battery calibration, refer to the 
“
Calibrating a Battery Pack” section later in this chapter. 
						

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Hardware and Software Guide 3–23
Displaying Charge Reports
To display battery charge information on the screen in Windows, 
use the Windows Power Meter feature described later in this 
section.
To access the Windows Power Meter display in Windows:
■Select Start > Control Panel > Performance and 
Maintenance > Power Options > Power Meter tab. 
– or –
■Select the Power Meter icon, which is displayed by default 
in the notification area, at the far right of the taskbar. 
To display the Power Meter icon if the default setting has been 
changed: 
»Select Start > Control Panel > Performance and 
Maintenance > Power Options.
 Select the Advanced tab, 
select
 the Always show icon on the taskbar check box, and 
then
 click OK.
Interpreting Charge Indicators
Power Meter displays battery status in both percent and time:
■The percent indicates the amount of charge remaining in the 
battery pack.
■The time indicates the approximate running time remaining 
on the battery pack if the battery pack continues to provide 
power at the current level. For example, the time remaining 
will decrease if you start playing a DVD and will increase if 
you stop playing a DVD. 
						

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Managing Low-Battery Conditions
This section describes default low-battery condition alerts and 
system responses. The default battery light responses cannot be 
changed. To change other responses, select Start > Control 
Panel
 > Performance and Maintenance > Power Options, and 
then follow the instructions on the screen. 
Identifying Low-Battery Conditions
When a battery pack that is the only power source for the 
computer reaches a low-battery condition, a text warning 
message is displayed, and the battery light blinks.
If a low-battery condition is not resolved and the amount of 
charge remaining in the battery pack continues to drop, the 
computer eventually enters a critical low-battery condition. 
When the computer is in Windows or standby and enters a critical 
low-battery condition: 
■If hibernation is enabled, the system initiates hibernation. 
Some unsaved work may be lost.
■If hibernation is disabled, the computer remains briefly in 
standby, and then shuts
 down. All unsaved work is lost.
Hibernation is enabled by default. To be sure that hibernation 
remains enabled, select Start > Control Panel
 > Performance 
and Maintenance > Power Options icon
 > Hibernate tab. If 
hibernation is enabled, the Enable hibernation check box is 
selected. 
						

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Hardware and Software Guide 3–25
Resolving Low-Battery Conditions
ÄCAUTION: To reduce the risk of losing information when the computer 
reaches a critical low-battery condition and has initiated hibernation, do 
not restore power until the power lights are turned off. 
To resolve a low-battery condition:
■If external power is available, connect the computer to the 
external power source.
■If a charged battery pack is available, shut down the computer 
or initiate hibernation, insert the charged battery pack, and 
then turn on the computer.
■If no power source is available, save your work and initiate 
hibernation or shut down the computer.
Calibrating a Battery Pack
Three steps are involved in calibrating the battery pack: fully 
charging, fully discharging, and then fully recharging. 
						

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When to Calibrate
Even if a battery pack is heavily used, calibration should be 
necessary only once a month. You do not have to calibrate a new 
battery pack. 
Calibration does not usually increase battery run time, but it can 
increase the accuracy of battery charge displays, especially under 
the following conditions:
■When the battery pack has been unused for one month 
or
 more.
■When you notice a significant change in battery run time.
■When the battery charge displays seem inaccurate.
For more information about battery charge displays, refer to 
the “
Monitoring the Battery Pack Charge” section earlier in 
this chapter.
How to Calibrate
To calibrate a battery pack, you must fully charge, fully 
discharge, and then fully recharge the battery pack while the 
computer is running Windows. 
Step 1: Charging the Battery Pack
Charge the battery pack while the computer is on. To charge the 
battery pack:
1. Insert the battery pack into the computer. 
2. Connect the computer to the AC adapter, an optional power 
adapter, or an optional expansion product, and then plug the 
adapter or device into external power. (The computer battery 
light is turned on.) 
3. Leave the computer connected to external power until the 
battery pack is fully charged. (The computer battery light is 
turned off.)