How to Check Laptop Battery health / Life status using windows command prompt |

You can check the battery health of a Windows laptop using built-in tools. As of my last knowledge update in September 2021, I'll provide you with instructions on how to do this using Windows PowerShell and Command Prompt. Please note that the specific steps might vary slightly depending on your Windows version.
*Using Windows PowerShell:*
1. Open the Start menu and search for "PowerShell." Right-click on Windows PowerShell and select "Run as administrator."
2. In the PowerShell window, type the following command and press Enter:
```
powercfg /batteryreport /output "C:\battery_report.html"
```
3. This command generates a battery report and saves it as "battery_report.html" in the C:\ directory. You can change the file path and name if you prefer.
4. Open File Explorer and navigate to the directory where you saved the report (C:\ in this example). Double-click the "battery_report.html" file to open it in your default web browser.
5. The battery report will provide information about your laptop's battery health, capacity, charge cycles, and more.
*Using Command Prompt:*
1. Open the Start menu, search for "Command Prompt," right-click on it, and select "Run as administrator."
2. In the Command Prompt window, type the following command and press Enter:
```
powercfg /batteryreport /output "C:\battery_report.html"
```
3. Navigate to the directory where you saved the report and open the "battery_report.html" file in a web browser.
As for a specific formula to check battery status, Windows doesn't provide a single formula to calculate battery health. Instead, it records various information about the battery's charge capacity, design capacity, charge cycles, and more in the generated battery report. The report contains detailed information that can help you understand the current state of your battery.
Remember that the battery health information provided by these tools is based on the battery's design capacity and its current capacity. Over time, a battery's capacity naturally degrades due to usage and age. If you're experiencing significant battery life issues, it might be a good idea to consider replacing the battery.