Windows has added a hidden “Battery Report” feature to Windows 8 and Windows 10 Laptops
You can Generate a report to see health information about your battery, how its capacity has decreased over time, and other interesting statistics.
First, open a Command Prompt window. Right-click in the bottom-left corner of your screen or press Windows Key + X, and then click the Command Prompt option in the list.
The command will save a battery report to your Windows directory.
To view the report, head to the following directory C:/Windows/battery-report.html double-click the file to open it.
Note: Report might be saved in C:/Windows/System32/battery-report.html