Windows Battery Report

Generate the Battery Report

1. Press Windows + X and choose Terminal (Windows 11) or Command Prompt (Windows 10).
2. Paste this command and press Enter:

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

3. Windows confirms the path it saved to — normally C:\Users\YourName\battery-report.html.
4. Open that file. It renders as a formatted page in your default browser.

Administrator rights are not required. If you get an access denied error, the output location is not writable — keep %USERPROFILE% in the command rather than pointing it at C:\ or a system folder.

How to Read the Report

Installed batteries — the section that matters

This is where battery health actually lives. Two rows do the work:

• Design Capacity — what the battery held when new, in mWh.
• Full Charge Capacity — what it holds now, fully charged.

Divide the second by the first for remaining health. A battery with a design capacity of 50,000 mWh and a full charge capacity of 42,000 mWh retains 84 percent, meaning 16 percent wear.

Cycle Count also appears here, though it is frequently blank or zero — many manufacturers never report it in firmware. That is a hardware limitation, not a fault, and the capacity comparison is the more dependable measure anyway.

Battery capacity history

A table of full charge capacity against design capacity over the machine's life. Useful for the trend: a gradual decline is normal ageing, whereas a sudden drop often points to heat damage or a firmware update changing how capacity is reported.

Battery life estimates

Compares observed runtime against what the battery should deliver at full health. This is the section to screenshot when arguing a warranty claim, since it shows real-world impact rather than a raw number.

Recent usage and usage history

Every power state transition over the last few days. Handy for tracking down a laptop that drains overnight while supposedly asleep — look for entries showing it stayed Active when it should have been suspended.

What the Numbers Mean

• 90 percent and above of design capacity — effectively like new.
• 80 to 90 percent — normal wear after a year or two.
• Below 80 percent — noticeably shorter runtime. Dell, HP and Lenovo generally treat this as the warranty replacement threshold.
• Below 60 percent — near end of life; expect roughly half the original runtime.

Check Your Warranty Before It Expires

Major manufacturers replace a battery under warranty once it falls below about 80 percent of design capacity. Because that threshold is often crossed quietly in year two, it is worth checking deliberately:

1. Run the report and work out your percentage.
2. If it is under 80 percent, look up your coverage — Dell by Service Tag, HP and Lenovo by serial number.
3. If still covered, open a claim and attach the report. The battery life estimates section is the most persuasive part.

Other Useful powercfg Commands

• powercfg /energy — a 60-second diagnostic producing an energy efficiency report that flags drivers and devices blocking sleep.
• powercfg /sleepstudy — a report on what woke the machine during modern standby, ideal for overnight battery drain.
• powercfg /devicequery wake_armed — lists every device permitted to wake the laptop.

Each writes an HTML file to the folder you point it at, using the same /output syntax as the battery report.

Buying or Selling a Used Windows Laptop?

Run the report while the machine is in front of you — it takes two minutes and cannot be faked the way a screenshot can. Under 80 percent capacity is worth roughly the cost of a replacement battery off the asking price, and on many modern ultrabooks the battery is glued in, which makes that replacement considerably more expensive than it sounds.

Battery is one of nine checks in our used laptop checklist, which also covers the screen, keyboard, camera, speakers and GPU. On a Mac, see MacBook battery health instead.

Reducing Battery Wear on Windows

• Enable the manufacturer's charge limit. Lenovo Vantage, Dell Power Manager, HP Command Centre and ASUS MyASUS all offer an 80 percent cap for machines that live on mains power. This is the single most effective setting.
• Lower screen brightness — the largest single power draw. The brightness test helps pick a comfortable lower level.
• Check which GPU is active. An app pinned to the discrete GPU drains far faster; the GPU test shows what is in use.
• Keep it cool and ventilated. Heat ages lithium-ion cells faster than cycles do.

Frequently Asked Questions