Private browser utility / Windows 10 + 11
Laptop battery health checker.
Free laptop battery health checker for Windows 10 and 11. Get a clear read on battery health for the moment you wonder whether the problem is your battery—not your charger, settings or guesswork. Your report stays in your browser.
- Nothing installed
- No account required
- Report stays on your device
100%local processing
0accounts needed
4signals explained
HTMLor manual input
Battery analyzer
Check your reported battery health
Use a Windows battery report for the fullest result, or enter two capacity values manually.
Drop your battery-report.html here
or choose the HTML file generated by Windows
HTML only · Maximum 10 MB · Processed locally
HTML
Your result
Reported battery health
—capacity health
Waiting for data
Your result will appear here
Capacity history
Reported full-charge capacity relative to design capacity.
This result reflects capacity values reported by the device. It is not a hardware safety diagnosis or manufacturer warranty assessment.
Built into Windows
Create a battery report in under a minute
Windows 11 can generate the HTML report without third-party software.
- 1Open Command Prompt
Search for Command Prompt, right-click it and choose Run as administrator.
- 2Run the battery report command
powercfg /batteryreport - 3Open the generated file
Windows displays its saved location. Find battery-report.html, then upload it above.
Simple by design
What the checker reads
The tool extracts only the battery fields needed to explain reported capacity.
Capacity values
Design Capacity is compared with Full Charge Capacity to calculate the reported health percentage and wear.
Cycle count
If Windows provides a cycle count, it is shown as supporting context rather than treated as a universal pass-or-fail number.
Capacity history
Available history points are converted into a simple trend so sudden changes or gradual decline are easier to notice.
Interpret carefully
What is a good laptop battery health percentage?
Capacity health is useful, but runtime, temperature, calibration and physical condition also matter.
Read the complete percentage guide →90–100% · Excellent
Reported capacity remains close to the original design value.
80–89% · Good
Normal wear is present, but the battery can still be practical for everyday use.
70–79% · Fair
Reduced runtime is likely. Monitor the trend and plan around shorter unplugged use.
60–69% · Worn
Capacity loss is substantial. Replacement may be worthwhile if runtime affects your work.
Below 60% · Replace soon
Confirm the reading after calibration and consider professional inspection or replacement.
Practical guides
Understand the numbers before taking action
Windows 11
How to check laptop battery health in Windows 11
Generate the report, calculate capacity health and avoid common interpretation mistakes.
Read guide → Battery drainWhy does my laptop battery drain so fast?
Separate active apps, capacity wear and sleep drain with Windows 11 evidence.
Diagnose fast drain → Cycle countHow to check laptop battery cycle count in Windows 11
Find Cycle Count in the Windows battery report and understand why the value may be missing.
Read guide → Battery reportHow to read every important battery report section
Learn what capacity, usage history, cycle count and estimates can tell you.
Read guide → Power statesWhat do Suspended and Connected Standby mean?
Read Windows battery-report power states and investigate unexpected standby drain.
Read guide → Sleep diagnosticsHow to read a Windows SleepStudy report
Compare Modern Standby sessions, energy change, DRIPS and recurring active components.
Diagnose standby drain → Health rangesWhat battery health percentage is considered good?
Use capacity percentages as context rather than a one-number diagnosis.
Read guide → ReplacementWhen should you replace a laptop battery?
Combine capacity, runtime, symptoms and safety signs before deciding.
Read guide → TroubleshootingWindows 11 battery report not working?
Fix powercfg errors, missing files, browser-opening problems and incomplete battery data.
Fix the report → Runtime estimatesWhat do battery life estimates mean?
Compare full-charge and design-capacity runtime, observed drains and blank estimates.
Read guide → Windows 10How to get a battery report in Windows 10
Use the Windows 10 menus to create the report, find the file and read battery health on an older laptop.
Read guide → Health rangesIs 80% battery health good?
What 80% means for runtime, when it is normal and when replacing the battery makes sense.
Read guide → Dell, HP, LenovoCheck battery health on Dell, HP and Lenovo
Brand battery tools explained: Dell BIOS, HP Hardware Diagnostics and Lenovo Vantage.
Read guide →Frequently asked questions
Laptop battery health FAQ
Does this tool upload my battery report?
No. The selected HTML file is read locally by JavaScript in your browser. This version of the checker does not transmit or store the report.
How is battery health calculated?
Reported capacity health equals Full Charge Capacity divided by Design Capacity, multiplied by 100. A result above 100% can occur after battery replacement, firmware changes or imperfect calibration.
Is 80% battery health bad?
Not necessarily. It means the battery reports about 80% of its original capacity. Runtime will be shorter, but replacement depends on your needs and any physical or reliability symptoms.
Why is cycle count missing?
Some laptop firmware does not expose cycle count to Windows. A blank value does not mean the battery has completed zero cycles.
Can this detect a swollen or unsafe battery?
No. Stop using a device if the battery is swollen, unusually hot, leaking, producing an odor or deforming the case. Capacity data cannot rule out a safety problem.
Does it work with Windows 10?
Yes, if Windows generates a compatible battery-report HTML file. The interface focuses on Windows 11 because that is the current primary search and support context.
Method and sources
Based on Windows-reported capacity data
Microsoft documents powercfg /batteryreport as a built-in way to generate an HTML report of battery usage characteristics. Read Microsoft’s battery-care guidance and the Powercfg documentation.
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