How to Check Laptop Battery Health with the Windows 11 Battery Report

If your Windows 11 laptop no longer lasts as long as it used to, the built-in battery report can help determine whether the problem is battery wear or simply higher power use.

The report is generated by powercfg and includes battery capacity, recent usage, charge history, and estimated runtime.

Generate the battery report

1. Right-click Start.
2. Open Command Prompt as administrator.
3. Run:

powercfg /batteryreport /output "%USERPROFILE%\battery-report.html"

Windows creates battery-report.html in your user profile folder. Enter %USERPROFILE% in File Explorer’s address bar, then open the report in a browser.

Compare Design Capacity and Full Charge Capacity

In the Installed batteries section, find:

• Design Capacity — the capacity the battery was designed to hold when new.
• Full Charge Capacity — the amount Windows currently sees the battery holding at a full charge.

If full charge capacity is significantly lower than design capacity, the battery has lost capacity through normal aging and use.

For example, a battery designed for 60,000 mWh that now reaches 45,000 mWh is holding roughly 75% of its original design capacity. Treat this as an estimate rather than laboratory-grade measurement because battery-controller reporting is not perfect.

Check Recent usage and Battery usage

The report shows when the machine was active, suspended, on AC power, or running from battery. This can help identify a sudden drain that happened during a particular session.

Review capacity history

The Battery capacity history section is useful because one reading can be misleading. A steady decline over months suggests normal wear; a sudden large drop may justify checking firmware, battery calibration guidance from the manufacturer, or the battery itself.

Look at battery-life estimates

Windows estimates runtime using observed power consumption. These numbers change depending on display brightness, workload, Wi-Fi use, background activity, refresh rate, and power mode.

A healthy battery can still deliver disappointing runtime if the laptop is doing more work than before.

Generate a report for a specific period

You can ask powercfg to focus on recent days:

powercfg /batteryreport /duration 7

This is useful when investigating a change that started recently.

When should you replace the battery?

There is no universal Windows percentage at which every battery must be replaced. Consider replacement when runtime no longer meets your needs, the manufacturer’s diagnostic reports a failure, the battery is swelling, or the laptop shuts down unexpectedly under load.

If the battery is swollen, stop using the device and follow the manufacturer’s safety guidance. Software calibration or power tweaks cannot repair a physically failing battery.

Do not judge health from one discharge session

A video call, game, Windows update, high display brightness, or poor wireless signal can drain a healthy battery quickly. Compare several sessions and the long-term capacity history before concluding that the battery itself is failing.

Also check the PC manufacturer’s battery-health utility where available. OEM tools may expose charging thresholds, battery preservation modes, cycle information, and hardware diagnostics that Windows’ generic report does not show.

Official references