The battery capacity display is not displayed on time, because long-term plug-in or light charging and discharging of lithium batteries will lead to system identification deviation. Calibration allows the system to re-learn the actual battery capacity through complete charging and discharging. The specific steps are: 1. Fully charge and do not use the computer when charging; 2. Unplug the power supply and discharge it naturally until it is automatically shut down; 3. Leave it for a few hours or overnight after shutdown to cool down; 4. Fully charge again to complete the calibration. In addition, you can also use the command prompt to enter powercfg /batteryreport to generate a battery report for "soft calibration" and view the numerical values of Designed Capacity and Full Charge Capacity to determine the battery status. It is necessary to note that some models have discharge protection mechanisms. When the battery ages or expands, it should be replaced first. Data must be saved before calibration to avoid loss.

If you find that the battery level of your laptop is not accurate, such as a sudden shutdown or a severe percentage jump, you may need to calibrate the battery. The Windows system itself does not have the function of calibrating the battery with one-click, but it can effectively help the battery level display more accurately through several steps, especially for old machines or laptops that are plugged in for a long time.

What is battery calibration? Why do you need to do it?

Battery calibration is actually to let the system re-learn the actual capacity of the battery. After long-term plug-in or frequent shallow charging and discharge of lithium batteries, the battery capacity display may be deviated. Through a complete discharge and charging process, the laptop's power management system can re-identify the battery status, making the percentage of power and remaining time more accurate.

How to manually calibrate laptop battery?

To perform a complete battery calibration, follow these steps:

• Fully charge the laptop (100%) and try not to use the computer during charging.
• Unplug the power adapter and let the battery run out naturally in normal use until it shuts down automatically.
• Continue to place the battery for a period of time (a few hours or overnight) after shutting down to make sure the battery is completely "calm".
• Plug the laptop into power again and you can complete a full calibration.

This process can take a whole day and is suitable for weekends or when you are not in a hurry to use a computer.

Is there any other way to "soft calibration"?

If you do not want to frequently discharge the battery and harm it, you can also try to generate a battery report through the system tool to check the health status and usage of the battery, and indirectly determine whether further operations are needed:

1. Open a command prompt (CMD) as an administrator.
2. Enter powercfg /batteryreport and press Enter.
3. The system will generate a battery report, which is usually saved in C:\Windows\system32\battery-report.html .
4. Open the report to view the values for "Designed Capacity" and "Full Charge Capacity". If the difference between the two is very large, it means that the battery is seriously aging and may need to be replaced.

This method will not "calibrate" the battery, but it can help you determine whether or not you really need to calibrate or replace the battery.

Some details to pay attention to

• Not all notebooks are suitable for frequent discharge, especially for models with battery protection mechanisms (such as some ThinkPads), which can be set up in the BIOS.
• If the battery has obviously expanded or the battery life has dropped seriously and calibration is useless, the battery replacement should be given priority.
• Remember to save the work before calibration to avoid data loss.

Basically that's it. Battery calibration is not complicated, but details are easy to ignore, especially many people think that it is enough to be "full and used up". In fact, the system learning process also requires time to update data.

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