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If your laptop battery is older or reporting incorrectly, it may be possible to recalibrate the battery. This can correct the reported capacity or extend the life of an old battery by correcting the gauge.

IMPORTANT: Recalibration does not save worn out batteries - it ONLY corrects the capacity. There is no way to recover a worn out battery, but the situation can be temporarily improved.

For help understanding what calibration is, why it’s important, and how to calibrate batteries in other types of devices, check out the Battery Calibration Wiki.

Guide notes

  • If your battery exceeds 30-40 °C (86-104 °F), REPLACE THE BATTERY!
  • You will likely see a capacity decrease. This is good - not bad.
  • Try to avoid using your laptop while it is charging. This may affect calibration accuracy.
  • Inconsistent reporting usually indicates an EOL battery. These are often uncorrectable.
  • If your battery is older, consider a ~10% discharge. A full discharge may cause damage.
  • If your laptop does not allow you to fully discharge the battery, you will need a workaround. Workarounds for UEFI/Legacy BIOSes are provided.

How to recalibrate the battery

  • Charge the laptop to 100%. Use it until it shuts down and no longer turns on.
    • See BIOS lockouts and known OEM quirks for HP and Lenovo laptops.
  • Immediately recharge the battery. Do not use the laptop if possible.

BIOS lockouts and known OEM quirks

  • (BIOS lockout) HP laptops have a 15% BIOS lockout and need to be bypassed for a full discharge. Immediately charge the battery once the laptop shuts off.
    • All HP laptops/2010+ Compaq.
  • (BIOS lockout) Some Lenovo laptops have a 7% critical capacity lockout (0190).
    • Only occurs if the laptop shuts off early. Easily bypassed.
  • (Known quirk) Dell batteries often hold incorrect data. This usually self corrects with a second calibration.

Onderdelen

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  1. This battery is too far gone for realibration.
    • This battery is too far gone for realibration.

    • Before recalibrating the battery, charge the battery to 100%. Take a note of the initial data.

  2. Do not do anything with irreplaceable data; this will be lost. Only plug the laptop in to start it from a BIOS lockout. Use your laptop while it is discharging. Do this until the computer shuts down. Use your laptop while it is discharging. Do this until the computer shuts down.
    • Do not do anything with irreplaceable data; this will be lost. Only plug the laptop in to start it from a BIOS lockout.

    • Use your laptop while it is discharging. Do this until the computer shuts down.

  3. While it is safe to use your laptop, the calibration accuracy may be affected. Every laptop has a different charge indicator. When your laptop is fully discharged, plug it in immediately. Fully charge the laptop.
    • While it is safe to use your laptop, the calibration accuracy may be affected.

    • Every laptop has a different charge indicator. When your laptop is fully discharged, plug it in immediately. Fully charge the laptop.

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  5. This procedure may finish off a near end of life battery.
    • This procedure may finish off a near end of life battery.

    • Once you are finished, check the BMS data. The reported data should be corrected.

  6. This may not work with some older batteries, even if they are OEM. Run Command Prompt as an administrator. Enter this command: powercfg /batteryreport. When the report is ready, you will receive a message stating where it is located. Check the data for consistency.
    • This may not work with some older batteries, even if they are OEM.

    • Run Command Prompt as an administrator. Enter this command: powercfg /batteryreport.

    • When the report is ready, you will receive a message stating where it is located. Check the data for consistency.

  7. This will fully discharge the battery. The HP diagnostics do not check the battery charge. Plug the laptop in and turn it on; unplug it once it is on. Press ESC and select System Diagnostics. Open the Component tests submenu. Select Memory or Hard Drive.
    • This will fully discharge the battery. The HP diagnostics do not check the battery charge.

    • Plug the laptop in and turn it on; unplug it once it is on. Press ESC and select System Diagnostics.

    • Open the Component tests submenu. Select Memory or Hard Drive.

    • Select Extensive test. Choose Loop until error.

    • When the laptop shuts off, immediately recharge the battery.

  8. DO NOT apply these settings to your primary OS. They may damage the battery. Boot the laptop into a live Linux Mint Cinnamon session. Open 'Settings and make the following changes: Open Power Management. Change When the battery is critically low to Do nothing.
    • DO NOT apply these settings to your primary OS. They may damage the battery.

    • Boot the laptop into a live Linux Mint Cinnamon session. Open 'Settings and make the following changes:

    • Open Power Management. Change When the battery is critically low to Do nothing.

    • Use the laptop until it shuts down. Everything from this session will be lost.

  9. Plug the power adapter into your laptop. POST must finish for the system to boot. Disconnect the laptop once the laptop is back on. Finish discharging the battery. Disconnect the laptop once the laptop is back on. Finish discharging the battery.
    • Plug the power adapter into your laptop. POST must finish for the system to boot.

    • Disconnect the laptop once the laptop is back on. Finish discharging the battery.

  10. To track the estimated health of the battery, labeling is recommended. This is not required, but makes health tracking easier. Note the date of the recalibration.
    • To track the estimated health of the battery, labeling is recommended. This is not required, but makes health tracking easier.

    • Note the date of the recalibration.

    • Note the original charge capacity (Designed capacity).

    • Note the current capacity of the battery (Full charge capacity).

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