Generating the report
Press Win+X and choose Terminal (Admin), because powercfg needs an elevated prompt for this. Run powercfg /batteryreport and Windows tells you where it saved battery-report.html — by default in the current working folder, so C:\Windows\System32 when you launch from the Win+X terminal. A cleaner way is to point the output somewhere you will find it: powercfg /batteryreport /output C:\battery-report.html.
Open the file by double-clicking it; it renders in any browser. Desktops without a battery get an error message instead of a report. The same happens on systems where the battery controller does not expose the needed interface.
Reading the numbers that matter
The Installed batteries section lists DESIGN CAPACITY and FULL CHARGE CAPACITY in mWh. Divide full charge by design capacity and multiply by 100: on a new laptop that lands near 100 percent. A battery below roughly 60–70 percent of its design capacity has lost enough range that replacement starts making sense.
The report also shows CYCLE COUNT where the hardware supports it, plus the Recent usage and Battery usage tables with discharge rates per period. In the Battery capacity history, a steadily dropping full-charge line over a year or two is the normal face of aging. For the difference in real terms, compare the Observed capacity and Design capacity columns in the battery life estimates at the bottom.
- DESIGN CAPACITY — how much energy the battery could hold when it was new.
- FULL CHARGE CAPACITY — what a full charge actually delivers today.
- Health ≈ full charge capacity ÷ design capacity × 100 percent.
- CYCLE COUNT — charge cycles consumed, when the firmware reports it.
- Battery capacity history — the month-by-month decline of the full charge figure.
What to do with a worn battery
A capacity below 70 percent mostly means shorter runtime, not danger. Sudden shutdowns at 20–30 percent remaining, a battery that never reaches 100 percent or one that swells physically are different matters — a swelling battery means stop using the device and have it serviced. Sudden shutdowns often point to a miscalibrated gauge, which a full discharge to shutdown and a complete recharge sometimes corrects.
When the numbers justify a replacement, prefer the laptop maker's original or a certified part, especially for models with the battery glued in. Repeat the report every few months. It takes ten seconds and gives you a dated trail of how the battery ages.
Questions and Answers
How do I check battery health in Windows 11?
Run powercfg /batteryreport in an elevated Terminal and open the generated HTML file. The ratio of FULL CHARGE CAPACITY to DESIGN CAPACITY is the battery's health percentage.
What is a good full charge capacity for a laptop battery?
It depends on the design capacity: what matters is the ratio. Above 80 percent of design capacity is healthy; below about 60–70 percent, the runtime loss usually justifies a replacement.
Why does powercfg /batteryreport fail on my PC?
Either the machine has no battery, or the prompt is not elevated. Open Terminal (Admin) via Win+X; on desktops the command cannot produce a report at all.
Know what is included before you buy.
The one-time 30-minute trial covers core tools. PRO-labelled features stay locked until a paid license is activated.
Read next
Write to us: [email protected]