Your laptop battery is the component you rely on most, and like every lithium-ion cell, it slowly loses capacity over time. Before you start chasing replacement parts or worrying about sudden shutdowns, Windows 11 can tell you exactly how healthy your battery is. The operating system ships with a built-in tool that generates a detailed battery health report, and you do not need to install any third-party software to use it.
This guide shows you how to create that report in under a minute, where the file lands on your PC, and how to read the numbers that actually matter. We also cover a simpler battery-usage view in the Settings app if you only want a quick glance at drain rates.
Before You Start: This method works on every Windows 11 edition, including Home, Pro, Enterprise, and Education. You only need your laptop’s built-in keyboard or any connected keyboard, and no administrator downloads or special permissions are required.
Step 1: Open Command Prompt
Press the Windows key and R at the same time to open the Run dialog, type cmd, and press Enter. This launches a classic Command Prompt window with a black background and a blinking cursor. You could also right-click the Start button and choose Terminal or Windows Terminal, but the Run dialog is the fastest route and works the same on every machine.
If a User Account Control prompt pops up asking for permission, click Yes. This is normal because the report tool writes a file to your computer, and Windows confirms you approved the action before it proceeds.
Step 2: Run the battery report command
Type powercfg /batteryreport /output "C:\\Users\\%USERNAME%\\battery-report.html" and press Enter. This single line tells Windows to measure your battery’s current condition and save a full HTML report to your user folder. The /output part names the file and picks the location, while %USERNAME% automatically fills in your account name so you never have to type it.
When the command finishes, you will see a message that says the report was saved, along with the full file path. If you see an error instead, make sure you typed the command exactly and that your Command Prompt is allowed to write files, as explained in the troubleshooting section below.
Step 3: Open the report file
Click the file path that the command printed, or press Windows + E to open File Explorer and navigate to your user folder. Look for a file named battery-report.html and double-click it to open it in your default web browser.
The report loads as a normal webpage with a header at the top and several sections below. If nothing opens, right-click the file, choose Open with, and pick a browser such as Microsoft Edge or Chrome.
Step 4: Read the battery health numbers
Scroll to the “Battery” section near the top and compare Design Capacity with Full Charge Capacity. Design Capacity is how much power the battery could hold when it left the factory, while Full Charge Capacity is the maximum it can hold today. Divide the Full Charge Capacity by the Design Capacity and multiply by 100 to find your battery’s remaining health percentage.
A healthy new battery usually reads between 95 and 100 percent. A number below 80 percent typically means the battery has worn enough that manufacturers consider it worth replacing, and you may notice your laptop dying sooner than it used to.
Pro Tip: Save the report now and run it again in six months. Comparing the two Full Charge Capacity numbers shows your degradation rate, which helps you decide whether a battery is failing early or wearing out normally.
The report also includes a “Usage” graph that shows when your laptop was on battery versus plugged in, and a “Capacity over time” graph that tracks how full charge drops across a day. Scan these charts for steep dips, which point to heavy drain from specific apps or background tasks.
Step 5: Check battery usage in Settings (quick alternative)
Open the Settings app, click System, then Battery, and scroll to the Battery usage section. This view shows a breakdown of which apps consumed the most power over the last 24 hours or 30 days, without generating a full report file.
This method is great for a quick check when you want to know why your battery drained overnight, but it does not show the Design versus Full Charge Capacity numbers that reveal long-term wear. Use it alongside the full report for the complete picture.
Troubleshooting
The command says “powercfg is not recognized as an internal or external command.” This rare error means the system cannot find the powercfg tool, usually because your PATH environment variables got corrupted. Restart your PC and try again; if the error persists, open a Command Prompt as administrator by right-clicking it in the Start menu and choosing Run as administrator before re-running the command.
You ran the command but cannot find the battery-report.html file. Confirm that you did not change the output path, and check the exact folder Windows printed in the Command Prompt window. Sometimes the file lands in C:\\Users\\Guest\\ or a renamed account folder, so search for battery-report.html in File Explorer’s search box to locate it quickly.
The report opens but shows no useful data or a blank capacity section. This happens mostly on desktops or 2-in-1 hybrids that lack a real battery, since the tool has nothing to measure. If you are on a desktop PC, this result is expected and you can skip the report; on a laptop, restart the device and regenerate the report after it fully boots.
Final tips
Keep a copy of each report in a dedicated folder so you can track your battery’s health over months and years. Running the command once a season gives you a reliable trend line without much effort.
Avoid keeping your laptop plugged in at 100 percent constantly, and enable the battery limit feature in Settings if your manufacturer offers one, as gentle charging habits can slow capacity loss. With these reports in hand, you can catch a failing battery early and plan a replacement before it strands you mid-work.
Over to you: What is your laptop’s current Full Charge Capacity percentage, and how old is the battery?
