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HP Notebook PCs - Troubleshooting Battery Power in Windows XP

There are many reasons why your notebook battery may not work as expected. Review the list of symptoms and follow the recommendations to troubleshoot your battery.

Symptoms and corrective actions

Click on the symptom listed below that most closely resembles the problem with your PC to view recommended methods for correcting the problem.

Is the symptom you are experiencing not listed?

If the problem with your PC is not listed, perform one or more of the following general corrective methods.

Method 1: Check the health of the battery

In 2005, HP added Smart Battery support to our notebook PCs. On an HP notebook PC, the health of the battery is accessible from a utility that HP provides in the HP Battery Health Center. This utility provides a simple, but accurate status of Pass, Fail or Calibrate. Troubleshooting instructions are available at Checking the health of the battery .

Method 2: Update the keyboard battery controller

Regularly check for updated versions of the system BIOS and keyboard battery controller. To determine if an update is available for your notebook PC, go to the Drivers and Downloads site . Enter the notebook model and the keywords Update BIOS. Follow the instructions presented for your specific notebook.

Method 3: Test the AC power adapter

The AC adapter must be connected to the PC and working properly for it to charge the battery.

  1. Disconnect the AC power adapter cord, remove the battery, and hold the Power button for 30 seconds. This will discharge the notebooks system capacitors.

  2. Connect the AC adapter to a working power outlet or surge protector and connect it to the notebook.

  3. Press the Power button to turn on the notebook.

    • If the PC does not start, the AC adapter is not working properly. Replace the adapter.

    • If the PC does start and operates normally, reconnect the battery and perform additional methods to resolve the symptoms.

Method 4: Measure the battery duration in Safe Mode

Some applications that operate in Windows consume more battery power than others. If your battery seems to lose power too fast, determine how long the battery holds a charge when operating in Safe Mode and compare that time to the normal duration of the charge when operating a Window's program.

  1. Connect your AC power adapter and completely charge the notebook battery.

  2. Press the Power button to restart the computer, and press the F8 key when the HP or Compaq logo appears. Select Safe Mode from the Startup Menu by using the arrow keys.

    NOTE: On some models that use UEFI instead of BIOS, no HP or Compaq logo displays during start up. If you are required to press key in the beginning stages of start up (when the logo normally appears on other models), do so as soon as the notebook starts. There may also be a text message that prompts you to press a specified key when the message appears.
  3. When Safe Mode appears, disconnect the AC power adapter from the notebook.

  4. Measure the total length of time the battery can power the PC in Safe Mode.

  5. When the PC stops operating, recharge the battery as shown in step 1, and restart in normal Windows to compare the battery duration.

If the difference in time is significant (30 minutes or greater) there may be unnecessary battery consumption in Windows. A large difference in discharge times could be caused by the application currently in use, or by an unneeded application running in the background.

Method 5: Refresh the Windows power management

Windows power management controls the battery usage for your notebook PC. Reinstall power management by following these steps.

  1. Connect the AC power adapter to the notebook then remove the battery.

  2. Press the Power button to restart the computer, and press the F8 key when the HP or Compaq logo appears. Select Safe Mode from the Startup Menu by using the arrow keys.

    NOTE: On some models that use UEFI instead of BIOS, no HP or Compaq logo displays during start up. If you are required to press key in the beginning stages of start up (when the logo normally appears on other models), do so as soon as the notebook starts. There may also be a text message that prompts you to press a specified key when the message appears.
  3. In Safe Mode, click Start then right-click My Computer. Select Properties from the list.

  4. Click the Hardware tab then click the Device Manager button.

    • If the PC has ACPI buttons, click the plus sign next to System Devices. Remove the listings for ACPI Power Button and ACPI System Button.
    • If the PC has a listing for Advanced Power Management Support feature, you will need to remove all listings for Advanced Power Management Support.
  5. When selecting and deleting an item, Windows will prompt you to restart the PC.

  6. During the restart, Windows will reinstall the needed ACPI drivers. If a prompt for the Windows Operating System CD appears, select Specify Location then type C: to allow Windows to locate the necessary drivers.

    NOTE: If multiple ACPI drivers were removed, it may be necessary to restart the notebook more than once to make sure the drivers are properly reinstalled.
  7. After the devices are reinstalled, turn the notebook off and reinsert the battery. Test again to see if the battery charges more efficiently.

Method 6: Schedule a repair

If the previous methods do not resolve the problem, schedule a repair.

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