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Recalibrating laptop batteries

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  1. Recalibrating laptop batteries, Log the original calibration data: passo 1, imagem 1 %32
    • This battery is too far gone for recalibration.

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

  2. Recalibrating laptop batteries, Use your laptop: passo 2, imagem 1 %32 Recalibrating laptop batteries, Use your laptop: passo 2, imagem 2 %32 Recalibrating laptop batteries, Use your laptop: passo 2, imagem 3 %32
    • Any data from this step will be lost. Only plug the laptop in to get the machine started from a BIOS lockout.

    • If you are using a Windows laptop, make sure you turn the laptop back on after the initial shutdown. Windows is designed to shut down when the battery in the laptop reports ~3% remaining capacity. This may require brief use of the power adapter if the laptop does not turn on until the charge is higher or it has AC power.

    • Use your laptop while it is discharging. You will want to do this until the computer shuts down, and if you are using Windows turn it on again until the laptop no longer turns on; this ensures a full discharge.

    May I recommend adding a step after this, "turn it back on and use it until it will no longer power back on"?

    Windows has software-defined cutoff at 3% (typically) where it will go to hibernate and "turn off" despite not truly being dead. Some batteries (Dell in particular) actually have a linear, metering-defined ramp-down to 0% based on stored energy memory - and only by going below 0% to the actual hardware cutoff (cell voltage limit / actual and real 0%), do you actually give it a chance to recalibrate in the upward direction.

    (nb: other laptop batteries have voltage-defined percentage; they hold at 7%, 5%, or 4%, until the cells reach the low-voltage cutoff and only then they'll move down to 3% to trigger Windows to hibernate/shutdown - these are much better than how Dell does it)

    Laptop batteries may drift especially when left unused for weeks/months, as they self-discharge but their metering doesn't detect the change. Then they wake up, think they have a very weak battery, and dramatically mis-calibrate themselves. Only way to get it back is to perform this full "true dead, true charge" calibration cycle - sometimes even more than once!

    Matt Falcon - Responder

    I've made the changes. I can't fully mess with it right now but let me know if you think I missed anything. On one hand the Dell methodology is crude but lets you run a battery beyond it's useful life as long as you really want to (as long as it's feasible) but it does result in accuracy issues requiring more frequent recalibrations. I have pushed them to 500+ cycles with recals and proper handling.

    Nick -

  3. Recalibrating laptop batteries, Plug your laptop in: passo 3, imagem 1 %32 Recalibrating laptop batteries, Plug your laptop in: passo 3, imagem 2 %32
    • 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.

  4. Recalibrating laptop batteries, Verify the new calibration data: passo 4, imagem 1 %32
    • This procedure may "kill" end of life batteries.

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

  5. Recalibrating laptop batteries, (Windows 10) Battery health check: passo 5, imagem 1 %32 Recalibrating laptop batteries, (Windows 10) Battery health check: passo 5, imagem 2 %32 Recalibrating laptop batteries, (Windows 10) Battery health check: passo 5, imagem 3 %32
    • This may not work if your battery is older, even if it is an OEM pack.

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

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

  6. Recalibrating laptop batteries, (HP UEFI) 15% lockout bypass: passo 6, imagem 1 %32 Recalibrating laptop batteries, (HP UEFI) 15% lockout bypass: passo 6, imagem 2 %32 Recalibrating laptop batteries, (HP UEFI) 15% lockout bypass: passo 6, imagem 3 %32
    • This will fully discharge the battery. HP diagnostics do not check the charge capacity.

    • 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.

  7. Recalibrating laptop batteries, (HP Legacy BIOS) 15% lockout bypass: passo 7, imagem 1 %32 Recalibrating laptop batteries, (HP Legacy BIOS) 15% lockout bypass: passo 7, imagem 2 %32 Recalibrating laptop batteries, (HP Legacy BIOS) 15% lockout bypass: passo 7, imagem 3 %32
    • 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.

  8. Recalibrating laptop batteries, (Lenovo 0190) Critical low battery bypass: passo 8, imagem 1 %32 Recalibrating laptop batteries, (Lenovo 0190) Critical low battery bypass: passo 8, imagem 2 %32 Recalibrating laptop batteries, (Lenovo 0190) Critical low battery bypass: passo 8, imagem 3 %32
    • Plug the power adapter into your laptop. Allow POST to finish before unplugging the laptop.

    • Disconnect the laptop once the laptop is booted. Finish discharging the battery.

  9. Recalibrating laptop batteries, (Optional) Label the battery: passo 9, imagem 1 %32 Recalibrating laptop batteries, (Optional) Label the battery: passo 9, imagem 2 %32
    • To better track the estimated health of the battery, labeling is recommended.

    • 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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Nick

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4 comentários

Did not help at all.

I have a Windows tablet, pretty old one - previously it was showing 39% battery wear (it actually was holding for about an hour, battery itself is a bir inflated).

A couple days ago it hard crashed and wear level was reseted to 0%. Now some weird stuff started: turning off when reaching 14% battery charge, screen dimming etc.

Tried this method, and as I said in the beginning - it did not help, still shows 0% wear.

Ослик Иа - Responder

Late response, but some laptops and Windows based tablets (notably HP) always show 0% wear in Batteryinfoview. You need to go into the UEFI diagnostics or use use HP Support Assistant and grab it from the advanced data on HP. If it’s Dell, UEFI SupportAssist (newer systems) or ePSA (legacy).

Nothing to worry about, but another quirk like the EOL capacity reporting response on some Dell batteries. Added a note in the quirks section about this.

Nick -

I’m curious, can we send command through the I2C interface from the laptop itself to the battery and do some calibration from there? is the built-in BMS has the capability to do that?

putraadriansyah08 - Responder

May battery charging shows 39% and it should be always plug in (windows 11) on Asus laptop.

Badri Momeni - Responder

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