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Testing and calibrating the battery (Windows)

The maximum capacity of a battery changes over time. To know the condition of your battery, test and calibrate your battery if necessary.

Because of this change in battery capacity, the charge level indicator in Windows might not show 100% charged. To know the condition of your battery, test your battery and calibrate it if necessary. Calibrating the battery resets the battery gauge to accurately display the charge level in Windows. In this document, two methods of testing and calibrating the battery are explained. Also, a manual method for calibrating the battery is presented.

If you notice your notebook battery is swollen or deformed, go to Swelling or deformation of notebook battery for more information.

Test the battery using HP Hardware Diagnostics (preferred method)

HP provides diagnostic software you can use to test hardware components on your computer and confirm hardware failures. The Battery Test checks your system to make sure the battery is functioning properly.

Use the following instructions to test the battery:

  1. Turn on the computer.

  2. Search for HP PC Hardware Diagnostics Windows, right-click the app in the search results, and then select Run as administrator.

    Clicking Run as administrator

    If the app is not installed on your computer, download the latest version, see Installing HP PC Hardware Diagnostics for Windows.

  3. Click Component Tests in the main menu.

    Selecting Component Tests on the Main Menu
  4. In the list of Component Tests, click Power.

    Selecting Power in Component Tests
  5. Select Battery Check, and then click Run once.

    Selecting Battery Check under Component Tests
  6. Wait while the test is in progress. The Battery Test takes about two minutes.

    Waiting while the test completes
  7. Click Finish on the Component Tests page.

    Clicking finish in the component test window
  8. Select Test Logs to see the results of the battery test.

    Selecting Test Logs in the HP PC diagnostic main menu
  9. When the testing is done, review the test logs that display for the status or condition of the battery.

    • If your battery passed, click Main Menu or click Details for more information.

    • If your battery failed, continue with these steps.

  10. Check the table below for suggested actions, and then write down the battery status and Failure ID. Keep the battery status and Failure ID so you have them available if you need to contact HP Customer Support.

    The information in the table is also available in the Test Logs section on the main menu.

    HP Support Assistant Battery Check Results

    Status

    Message

    Suggested action

    Passed

    The battery functions properly and as expected.

    Read the remainder of the message for more information.

    Weak

    or

    Very Weak

    The battery functions correctly, but due to normal aging of the battery, the battery life between charges is now significantly shorter than when it was new.

    This status message is displayed when there is decrease in capacity of battery that occurs over time and with use. The battery should be replaced to get the most working time out of your battery.

    Replace

    The battery reports a failure and needs to be replaced as soon as possible.

    Replace the battery. If your computer is within its warranty period, you can contact HP support to verify if your battery is covered.

    Failure with an ID number

    The battery experienced a hardware failure.

    Write down the battery status and Failure ID. Keep the battery status and Failure ID so you have them available if you need to contact HP Customer Support.

    No Battery

    HP Battery Check did not detect a battery.

    A battery is not installed or detected in the battery compartment. If a battery is installed, remove the battery and inspect the pins to see if there is dirt or other foreign matter blocking the connection. Fully insert a battery into the compartment if a battery was not inserted and you want to test the battery in that compartment.

    Unknown

    HP Battery Check could not access the battery.

    Remove and reinsert the battery. You might need to download and install all the updates from HP Support Assistant.

Installing HP PC Hardware Diagnostics for Windows

This tool runs within the Windows operating system to diagnose hardware failures.

  1. To download the latest version, go to the HP Hardware Diagnostics website.

  2. In the How do I Use Diagnostics? section, click Download HP Diagnostics Windows.

    Downloading Hardware Diagnostics for Windows

  3. Click Save.

  4. Navigate to the folder on your computer or the flash drive where you downloaded the .exe file and double-click the .exe file.

    The InstallShield wizard opens.

  5. Click Next.

  6. Accept the terms of the license agreement and click Next.

  7. Choose where to save the files and click Next.

    • To run the software on your computer, download it to the computer desktop.

    • To run the software from a USB flash drive, download it to a USB flash drive.

    Choosing the location to save the files
  8. Click Next to install the software.

  9. When the installation is complete, click Finish to close the Setup Wizard.

  10. In Windows, search for HP PC Hardware Diagnostics for Windows and select Run as administrator.

    Selecting Run as administrator

  11. When the tool opens, select the type of diagnostic test you want to run, and then follow the on-screen instructions.

    Note:

    If you need to stop a diagnostic test at any time, click Cancel.

    System tests menu Component tests menu

Test the battery using HP Support Assistant

HP Battery Check is a utility in HP Support Assistant that provides a simple but accurate test of the battery in Windows.

To use HP Support Assistant to check and calibrate the battery, follow these instructions:

  1. In Windows, search for and open HP Support Assistant.

    If the app is not installed on your computer, go to HP Support Assistant to download the latest version.

  2. Select the My devices tab, and then select your computer from the device list.

    Selecting My Notebook from the HP Support Assistant home screen
  3. Click the Troubleshooting and fixes tab, and then select Battery Check.

    Selecting Troubleshooting and fixes and then Battery Check
  4. Wait while the battery check completes.

    HP Battery Check displays the results.

    Battery test results
  5. Review the HP Support Assistant Battery Check results. Status results you might see include:

    HP Support Assistant Battery Check Results

    Status

    Message

    Suggested action

    Passed

    The battery functions properly and as expected.

    Read the remainder of the message for more information.

    Weak

    or

    Very Weak

    The battery functions correctly, but due to normal aging of the battery, the battery life between charges is now significantly shorter than when it was new.

    This status message is displayed when there is decrease in capacity of battery that occurs over time and with use. The battery should be replaced to get the most working time out of your battery.

    Replace

    The battery reports a failure and needs to be replaced as soon as possible.

    Replace the battery. If your computer is within its warranty period, you can contact HP support to verify if your battery is covered.

    Failure with an ID number

    The battery experienced a hardware failure.

    Write down the battery status and Failure ID. Keep the battery status and Failure ID so you have them available if you need to contact HP Customer Support.

    No Battery

    HP Battery Check did not detect a battery.

    A battery is not installed or detected in the battery compartment. If a battery is installed, remove the battery and inspect the pins to see if there is dirt or other foreign matter blocking the connection. Fully insert a battery into the compartment if a battery was not inserted and you want to test the battery in that compartment.

    Unknown

    HP Battery Check could not access the battery.

    Remove and reinsert the battery. You might need to download and install all the updates from HP Support Assistant.

Test the battery before Windows starts

Perform a battery test before Windows starts.

After the battery charges and discharges, recharge it back to a full charge.

  1. Unplug the power cord.

  2. Press and hold the Start button for at least five seconds to turn off the computer.

  3. Turn on the computer and immediately press Esc repeatedly, about once every second. When the startup menu appears, press F2. The HP PC Hardware Diagnostics menu displays.

  4. Click Component Tests in the main menu.

    Selecting Component Tests
  5. In the list of Component Tests, click Power.

  6. In the list of Power Tests, click Battery.

  7. On the Battery Test, click Run once. The Battery Test begins.

    The Battery Test takes about two minutes. The Battery Calibration, if needed, requires 2 to 4 hours. You can cancel at any time by pressing the Esc key.

    Battery Test screen with Run once selected
  8. Wait while the battery check completes.

  9. When the testing is done, review the first line on the Battery Check page that displays for the status or condition of the battery.

    • If your battery passed, click Main Menu or click Battery Details for more information.

      Example of a passed Battery Check
    • If the battery passes and needs to be calibrated, click Calibrate Battery.

      Passed battery check and need to calibrate
  10. If your battery failed, check the table below for suggested actions, and then write down the battery status and Failure ID. Keep the battery status and Failure ID so you have them available if you need to contact HP Customer Support.

    The information in the table is also available in the Test Logs section on the main menu.

    HP Diagnostics Battery Test Results

    Status

    Message

    Suggested action

    Passed

    The battery functions properly and as expected.

    The battery does not need calibration. Read the remainder of the message for more information.

    Calibrate

    The battery functions correctly, but it needs to be calibrated.

    Read and respond to the message that displays. If the option to use the HP battery auto calibration feature displays, this is preferred. Otherwise, click Learn How to Calibrate your Battery for the steps to calibrate your battery.

    Note:

    Battery calibration might take several hours to complete and is best performed during long periods when the computer is not in use.

    Weak

    or

    Very Weak

    The battery functions correctly, but due to normal aging of the battery, the battery life between charges is now significantly shorter than when it was new.

    This status message is displayed when there is decrease in capacity of battery that occurs over time and with use. The battery should be replaced to get the most working time out of your battery.

    Replace

    The battery reports a failure and needs to be replaced as soon as possible.

    Replace the battery. If your computer is within its warranty period, you can contact HP support to verify if your battery is covered.

    Failure with an ID number

    The battery experienced a hardware failure.

    Write down the battery status and Failure ID. Keep the battery status and Failure ID so you have them available if you need to contact HP Customer Support.

    No Battery

    HP Battery Check did not detect a battery.

    A battery is not installed or detected in the battery compartment. If a battery is installed, remove the battery and inspect the pins to see if there is dirt or other foreign matter blocking the connection. Fully insert a battery into the compartment if a battery was not inserted and you want to test the battery in that compartment.

    Unknown

    HP Battery Check could not access the battery.

    Remove and reinsert the battery. You might need to download and install all the updates from HP Support Assistant.

Swelling or deformation of notebook battery

In order to protect your hardware from potential damage, HP recommends that customers experiencing battery swelling discontinue use of the notebook until the battery can be replaced. Customers should contact HP to understand what battery replacement options are available.

  • Noticing a swollen battery: Customers may notice that their notebook battery may become somewhat deformed or swollen over time. In some cases, the battery swelling may be significant enough to impact other components of the system including the touchpad, keyboard and chassis.

  • Not a safety issue: A swollen battery does not present a safety issue. It is the result of the generation of gases per the normal degradation of the battery cell over time. HP has worked closely with our battery cell suppliers and third-party industry experts to help minimize the potential for HP batteries to swell over time and to identify that swollen batteries are not a safety issue.

  • Discontinuing use: In order to protect your hardware from potential damage, HP recommends that customers experiencing battery swelling discontinue use of the notebook until the battery can be replaced. Customers should contact HP to understand what battery replacement options are available.

  • Replacing a swollen battery: If a battery is under warranty, HP will replace the battery per the terms and conditions of the HP Worldwide Limited Warranty or applicable HP Care Packs. For batteries no longer under warranty, contact HP to purchase a genuine HP replacement battery.

  • Minimizing battery swelling: There are multiple drivers that can accelerate battery swelling. To help mitigate battery swelling over time, customers should use the HP Battery Health Manager settings found in the HP BIOS. Available on most HP Commercial Notebooks, the Battery Health Manager feature provides a number of options designed to improve battery longevity and performance for various usage scenarios.

Calibrate the battery manually

Learn how to manually calibrate the battery.

Manually calibrating the battery requires four steps: fully charge the battery, discharge or drain the battery, recharge the battery, and then run the battery test. Calibrating the battery improves the accuracy of the battery gauge software so that it more accurately displays the current level of charge. These instructions work with most battery types.

Charge the battery

Use the power cord to charge the battery to a full charge.

To charge the battery with the power cord:

  1. Plug in the power cord.

  2. Charge the battery to a full charge, 99% to 100%. To check the battery charge, mouse over the battery icon in the system tray on the Desktop.

Discharge the battery

Use HP PC Hardware Diagnostics to discharge the battery.

After the battery fully charges, discharge the battery using HP PC Hardware Diagnostics.

  1. Unplug the power cord.

  2. Press and hold the Power button for at least five seconds to turn off the computer.

  3. Turn on the computer and immediately press the F2 key repeatedly, about once every second until the HP PC Hardware Diagnostics UEFI menu displays.

  4. Click Component Tests in the main menu.

    Note:

    The purpose is to drain or discharge the battery, not get the results of the test. The battery discharges and the computer turns off before the test results display.

    Selecting Component Tests in HP PC Hardware Diagnostic UEFI
  5. In the list of Component Tests, click Memory.

    Selecting Memory in Component Tests
  6. Click Extensive Test.

    Selecting Extensive Test in Memory Test
  7. Click Loop until error to start the test. Let the test continue until the battery is completely discharged and the computer shuts down.

    Note:

    This test only discharges the battery and does not impact the memory.

    Selecting Loop until error in Extensive Test

Recharge the battery

Recharge the battery fully before you calibrate the battery.

To recharge the battery:

Note:

If you run the HP Battery Check before the battery charges fully, you might get a false battery failure result.

  1. Plug in the power cord to charge the battery.

  2. Charge the battery to a full charge, 99% to 100%. To make sure the computer reaches a full charge, keep the computer attached to the power cord for at least 3 hours.

    Note:

    The battery continues to charge with the computer on or off.

  3. Check the battery charge. Turn on the computer and start Windows normally. On the desktop mouse over the battery icon in the system tray to view the battery charge percentage. Make sure the battery charge percentage is 99% or 100%.

    Note:

    If you plug in your power cord and immediately run the HP Battery Check, you might get a false failure showing the battery is bad. If the battery is in a low-charge state (at less than 3%) you might also get a false reading.

Use Battery Health Manager (business notebooks only)

Provides a number of settings designed to improve battery longevity and performance for select HP business computers.

Open the BIOS, navigate to the Battery Health Manager, and then choose the settings you want, depending on how you use your computer.

  1. Turn off the computer, and then connect the power cord if it is not already connected.

  2. Turn on the computer, and then repeatedly press the esc key until the Startup Menu displays.

  3. Press F10 to open the BIOS Setup Utility.

  4. Using the arrow keys, select Advanced, and then select Power Management Options.

    The Battery Health Manager feature displays. If you do not see Battery Health Manager, go to the HP Customer Support Software and Driver Downloads page to update the BIOS to the most current version available.

  5. Click the drop-down menu to review, and then select a Battery Health Manager setting:

    • Maximize my battery health: Use this setting if the computer stays plugged in to the power adapter most of the time. This setting maximizes battery health by lowering the maximum battery charge level to 80%.

    • Let HP manage my battery charging: Use this setting if the computer is operating under a heavy load or being used in hot environments. Charging behavior automatically adjusts to balance between maximizing battery health and maximizing battery duration.

    • Maximize my battery duration: Use this setting if you need to have the battery fully charged when taking the computer off the charger. The battery charges to 100%, and then stops charging only to resume when the charge level falls to 95%.

      Note:

      This setting might shorten the battery lifespan.

      Selecting a Battery Health Manager setting for your battery
  6. After you choose a setting, click Save, and then exit the BIOS Setup Utility.

Frequently asked questions (FAQs)

Review the frequently asked questions about testing and calibrating the battery.

What if my computer does not have the HP PC Hardware Diagnostics for Windows?

Some computers might not have the HP PC Hardware Diagnostics Windows tool. HP provides diagnostic software you can use to test hardware components on your computer.

The HP PC Hardware Diagnostics for Windows is a Windows -based utility that allows you to run diagnostic tests to determine whether the computer hardware is functioning properly. The tool runs within the Windows operating system to diagnose hardware failures.

  1. Open a web browser, and then go to the HP Hardware Diagnostics website.

  2. Scroll down the screen to the HP PC Hardware Diagnostics Windows section, and then click Download Diagnostics Windows.

    Downloading Hardware Diagnostics for Windows
  3. Follow the on-screen instructions to download and install the HP PC Hardware Diagnostics for Windows.

For more information about the HP PC Hardware Diagnostics for Windows, go to Installing HP PC Hardware Diagnostics for Windows.

How do I run HP if it does not load from the hard drive?

You can install the HP PC for Windows to a blank FAT or FAT32 formatted USB drive to use when the main storage device fails or when the UEFI files are corrupted.

  1. Insert a formatted USB into your computer.

  2. Open a web browser, and then go to the HP Hardware Diagnostics website.

  3. Scroll down the screen to the HP PC Hardware Diagnostics Windows section, and then click Download Diagnostics Windows.

    Downloading Hardware Diagnostics for Windows
  4. Follow the on-screen instructions to download the HP PC Hardware Diagnostics for Windows.

  5. When the Setup Wizard prompts you to select the installation location, select USB Flash Drive.

  6. Follow the on-screen instructions to complete the installation of the HP PC Hardware Diagnostics for Windows.

What if my computer does not have HP Support Assistant?

Download the latest version of HP Support Assistant.

To download and install HP Support Assistant, go to HP Support Assistant, click the Download button, and then follow the on-screen instructions.

How do I interpret the results of the advanced battery check report?

Review the list for more information about the results that display under Battery Details or Advanced Information.

Examples of the detailed results of a battery check
  1. HP PC Hardware Diagnostics UEFI

  2. HP Support Assistant

Examples of the detailed results of a battery check:

  • Charged or Discharging: Percentage displays how close to a full charge the battery is. Displays 'charged' when the power cord is plugged into the computer or 'discharging' when the power cord is disconnected.

  • Primary Battery: Summarizes the test result for the primary battery.

  • Warranty Type: Describes the warranty of the battery.

  • Cycle count: The number of times the battery can be fully discharged and recharged. In the example, the battery has been charged and discharged 38 times out of 1000.

  • Manufacturer: A code displays indicating the manufacturer of the battery.

  • Battery Age: The number of days since the battery was manufactured.

  • Serial Number: The serial number of the battery.

  • Temperature: The temperature of the battery.

  • Design Capacity: Displays the designed charge capacity of the battery.

  • Full Charge Capacity: Displays the capacity of the battery when fully charged.

  • Remaining Capacity: Displays the remaining charge of the battery in milliampere hours (mAh) instead of a percentage.

  • Current: The discharge current, represented in milliamperes (mA). When the computer uses AC power, the current displays as "0 mA."

  • Terminal Voltage: The voltage output from the battery terminals.

  • Design Voltage: Displays the designed voltage of the battery.

  • Cell Voltage (1-4): Each battery has up to four cells. Cell Voltage represents the capacity for each individual cell. If one or more of the Cell Voltage items shows "0mV," the battery contains three or fewer cells.

  • Status: Provides a code indicating additional battery status information for service technicians.

  • AC Power: Displays "Yes" when the power cord is plugged in, or "No" when the power cord is disconnected from the computer.

  • CT Number: This number is the identifying number printed on the barcode on the battery.

  • Secondary Battery: Indicates the presence of another battery.

Why does the battery status display 'charged' when the battery is not charged 100%?

To protect the battery from multiple, brief charging sessions when you connect the power cord, the battery does not begin charging until the charge falls below 94%.

Results displaying 'Charged' when the battery is at 98%

How do I maximize the capacity and life span of the battery?

Recommendations for battery use and storage are covered in the HP User Guides for each model. Review this additional information on battery care practices.

  • Store Li-Ion batteries between 20°C and 25°C (68°F and 77°F) with 30% to 50% charge.

  • Do not disassemble, crush, or puncture a battery; do not short the external contacts on a battery; and, do not dispose of a battery in fire or water.

  • Do not leave batteries exposed to high temperatures for extended periods. Prolonged exposure to heat (for example, inside a hot car) will accelerate the deterioration of Li-Ion cells.

  • Remove the battery if the notebook will be stored (turned off and not plugged into AC power) for more than 2 weeks.

  • Remove the battery from the notebook if the notebook will be plugged into AC power continuously (via a wall adapter or docking station) for more than 2 weeks.

  • Use the type of battery with the highest capacity (Ah) rating if the notebook will run high-end applications on battery power.

  • Calibrate the battery based on the usage model. Under normal usage, batteries should be calibrated a minimum of once every 3 months; however, a battery that is rarely discharged fully should be calibrated about once a month.

  • Keep the battery away from children.

  • Use only the battery provided with the computer, a replacement battery provided by HP, or a compatible battery purchased as an accessory.

How do I conserve battery power?

You can manually change the power consumption of your notebook PC and conserve battery power.

  • Reduce the brightness of the screen to the minimum readable level. Use the fn and F7 or F8 keys to adjust the brightness.

  • Remove peripherals when not in use. External hard drives, CD-ROMs, Zip drives, PC cards, and other peripheral devices can draw power from your battery even when they are not in active use. Disconnect them when you have finished using them.

  • Reduce the speed of your processor. The faster your computer works, the more quickly it uses up the supply of power. By cutting down on processor speed, you can extend the charge of your battery. Methods to reduce processor speed vary from model to model, and your manual should provide instructions for doing so.

  • Turn off the Wireless On-Off button when it is not in use. If your notebook has one, press the Wireless On-Off button so that the light turns off.

  • Check for programs running in the background. Some programs automatically install a quick-start utility and run in the background when the computer is started. You can decrease the power requirements by periodically searching for and removing unnecessary programs.

What if my original battery charges slowly, but the replacement battery charges normally?

If the original battery charges too slowly, but a replacement battery charges as it should, the battery might not be at fault.

Before you replace the battery that might be defective or worn out, use the following instructions to determine if the battery needs to be replaced.

  1. Search for and open Device Manager.

  2. Click the arrow next to Batteries to expand the battery options.

    Device Manager with Batteries highlighted
  3. In the Batteries options menu, right-click each ACPI option, and then click Uninstall.

    The battery should now charge properly. If not, it might need to be replaced.

    Device manager with ACPI options highlighted
  4. Restart the computer.

When should I replace the battery?

A notebook battery typically lasts between three and five years before replacement becomes necessary. Running the diagnostic tests help determine when it is time to replace the battery.

Once a battery reaches the end of its useful life, you have a choice to either replace the notebook, or just replace the battery. By replacing the battery instead of the notebook, you prolong the life of the notebook, which reduces both cost of ownership, and technology waste.

HP recommends purchasing genuine HP replacement batteries through HP dealers and vendors to avoid illegitimate or counterfeit products.

Where can I get a replacement battery?

Before ordering a battery, you need to know the product number of your notebook to determine the part number of the replacement battery.

Different notebook models require different batteries. To find your product number, use HP Support Assistant or locate the product number on the product label.

Note:

HP strongly recommends purchasing genuine HP replacement batteries. HP batteries are manufactured to meet or exceed international industry safety standards and are produced by the same vendors as the original batteries sold with notebooks. HP stands behind the performance of all HP products when using genuine HP replacement batteries.

  • In Windows, search for and open HP Support Assistant. When HP Support Assistant opens, the product name, product number, and serial number of the notebook display.

    To download and install HP Support Assistant, go to HP Support Assistant, and then follow the on-screen instructions.

  • To locate notebook product number using the product label, turn off the notebook. Turn the notebook over, and then locate the HP product label on the bottom of the notebook. The product number (P/N) is printed on this tag.

    Note:

    On some models, the product tag might be located inside a battery compartment or behind an access panel.

For more detailed information, go to Order a replacement battery.

Order a replacement battery

Order a new battery from the HP Parts Store.

Note:

Some countries or regions might not be supported when ordering parts from HP.com. See your local HP retailer or contact HP directly to purchase additional batteries or other parts.

  1. Go to the HP Parts Store.

  2. In the Find your part field enter your product number, and then press the Enter key.

    Note:

    Remove the suffix from the product number. For example, DZ357U#ABA is entered as DZ357U.

  3. Under Buy certified HP genuine replacement parts, select your country/region and language.

  4. Type the Serial Number, Product number, or Product name in the field, and then click the Search for a part button.

    Note:

    If you are using the product number to search, remove the suffix from the product number. For example, type product number DZ357U#ABA as DZ357U.

  5. Find your notebook, and then select the appropriate product number.

  6. Find the battery in the part list, and follow the instructions to purchase the battery from HP or from HP Parts Store partners.

Why are quality control and safety designs important in replacement lithium ion batteries?

The high energy densities of lithium ion batteries present a potential danger if safety design guidelines and features, and production quality control are not strictly adhered to.

The media are full of examples where deficiencies in lithium ion batteries have resulted in thermal events and product safety recalls. HP has strict criteria throughout the battery development and production process to minimize any possibility of product failures. HP strongly encourages consumers to purchase genuine HP replacement batteries, from authorized dealers.

CAUTION:

Counterfeit batteries: Unauthorized sources might offer replacement batteries as “genuine HP” or “authentic HP” or “original HP” when they are actually counterfeit. Such batteries are typically offered at price points below $45 USD, which is less than the cost of manufacture of an HP battery. HP cannot control the performance of HP notebooks when using counterfeit batteries.

Battery Warranties

In HP notebooks, standard and long-life batteries are covered under separate warranties from the notebook without exception. While the battery warranty might match the duration of the notebook warranty, they are in fact two separate warranties.


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