Windows 10 can generate a detailed battery report that shows how much your laptop battery has worn down, how many charge cycles it has been through, and how long it lasts on a charge now compared with when it was new. The report is free and built in, but it’s full of numbers and tables that aren’t explained anywhere. This guide shows how to create the report and, more importantly, how to read each section and work out your battery’s health.
Quick Answer
Open Command Prompt, run powercfg /batteryreport, and open the battery-report.html file it creates. Under Installed batteries, divide Full charge capacity by Design capacity and multiply by 100. That’s your battery health. Above 80% is good; below about 60% usually means it’s time for a replacement.
Step 1: Generate the Battery Report
- Press Windows + S, type cmd, and open Command Prompt. (PowerShell or Windows Terminal works too.)
- Type this command and press Enter:
powercfg /batteryreport /output “%USERPROFILE%\battery-report.html” - Windows replies “Battery life report saved to file path…”.
- Press Windows + R, paste %USERPROFILE%\battery-report.html, and press Enter to open it in your browser.
If you run just powercfg /batteryreport, the file is saved in the folder shown in the prompt, usually C:\Users\YourName, or C:\Windows\System32 if you opened Command Prompt as administrator.
Desktop PCs have no battery, so the command returns an error or an empty report.
Step 2: Read Each Section of the Report
Header
Computer name, model, BIOS version, OS build, and report time. Useful mainly for checking you’re looking at the right PC.
Installed batteries (the most important section)
| Field | What it means |
|---|---|
| Name / Manufacturer / Serial number | Identifies the battery. Handy when ordering a replacement. |
| Chemistry | LiP (lithium polymer) or LION (lithium-ion). Both wear similarly. |
| Design capacity | How much energy the battery held when new, in milliwatt-hours (mWh). |
| Full charge capacity | How much it holds now when fully charged. This number drops as the battery ages. |
| Cycle count | Number of full charge cycles (two 50% charges = one cycle). Many laptop batteries are rated for roughly 300 to 1,000 cycles; check your manufacturer’s spec. Some laptops report “-” if the battery doesn’t share this data. |
Recent usage
A log of the last three days showing when the laptop was active, suspended (asleep), or connected to AC power, with the remaining capacity at each point. The report shows when the laptop was in use but not time per app, so for that question see what Windows 10 records about screen time.
Battery usage
A graph and table of battery drain over the last three days. Steep drops show heavy use or a background process draining power.
Usage history
Daily or weekly totals of time spent on battery versus plugged in, going back to when Windows was installed.
Battery capacity history
Full charge capacity next to design capacity over time. This shows how fast your battery is wearing out. A sudden drop can mean a calibration issue rather than real wear.
Battery life estimates
Windows’ estimate of how long a full charge lasts, based on your actual usage. The At full charge column shows today’s runtime, and the At design capacity column shows what you’d get with a new battery. The line Since OS install at the bottom gives an overall average.
Step 3: Calculate Battery Health
Battery health (%) = Full charge capacity ÷ Design capacity × 100
| Health | What it means |
|---|---|
| 90–100% | Like new |
| 80–89% | Normal wear, fine for daily use |
| 60–79% | Noticeably shorter runtime; consider a replacement if it bothers you |
| Below 60% | Heavily worn; replacement recommended |
A new battery can show slightly more than 100%. That’s normal manufacturing variation.
Warning Signs to Act On
- Swelling: If the touchpad is lifting, the case is bulging, or the laptop rocks on a table, stop using it and get the battery replaced. A swollen battery is a safety risk regardless of what the report says.
- Health dropping fast: A drop of more than 10% in a few months on a newer laptop may be covered by warranty.
- Laptop shuts off at 20–30%: Usually a worn battery or a calibration problem.
Other Useful powercfg Reports
- powercfg /energy runs a 60-second check (as administrator) and lists power problems like devices preventing sleep.
- powercfg /sleepstudy shows battery drain during sleep on laptops with Modern Standby.
Make Your Battery Last Longer
- Avoid keeping the laptop at 100% and hot for long periods. Many manufacturers’ apps offer a charge limit (often 80%).
- Keep vents clear; heat wears batteries fastest.
- Use Battery saver (Settings > System > Battery) when running on battery for long periods.
Frequently Asked Questions
Is the battery report accurate?
It uses data from the battery’s own controller, so it’s a good guide, though values can drift. Fully charging and then running the battery down once can recalibrate the readings.
Does this work on Windows 11?
Yes. The same command and report work in Windows 11.
Why is Cycle count blank?
Some batteries don’t report it to Windows. Your laptop maker’s diagnostic app may show it.
Summary
- Run powercfg /batteryreport in Command Prompt.
- Open battery-report.html.
- Divide Full charge capacity by Design capacity for battery health.
- Check cycle count and battery life estimates to decide if a replacement is worth it.
Kermit Matthews runs Live2Tech from just outside Philadelphia. He started on a university help desk, spent years as the IT person for small businesses, and has been writing tech guides full time since 2020. Each guide is checked on a device he owns, and re-checked when a menu moves. More about Kermit.