Windows 11 has a built-in battery report tool that shows your battery's current capacity, design capacity, and wear level

The fastest way to check your battery health is through the Command Prompt, which generates a detailed report in seconds. Windows 11 stores this information in a file you can open and read yourself — no third-party software needed. The report tells you whether your battery is holding a normal charge or degrading, which matters because batteries lose capacity over time and eventually need replacement.

A healthy battery should show a cycle count under 500 (for typical daily use over two to three years) and a wear level under 20 percent. If your battery shows 30 percent wear or higher, or if your laptop shuts down suddenly despite showing 40 percent charge remaining, the battery is likely failing and replacement may be worth considering.

Key Takeaways

  • Open Command Prompt as administrator, type powercfg /batteryreport, and press Enter to generate a battery health file in your user folder.
  • The report shows design capacity (what the battery held when new), current capacity (what it holds now), and wear level as a percentage.
  • A wear level above 30 percent or a current capacity below 80 percent of design capacity suggests the battery is degrading faster than normal.
  • Battery health degrades from charge cycles, heat exposure, and age — even if you rarely use the laptop, a battery older than three years may show significant wear.

How to generate the battery report using Command Prompt

Right-click the Start menu and select Terminal (Admin) or Command Prompt (Admin) — both work the same way. If you see a User Account Control prompt asking for permission, click Yes.

Type the following command exactly as shown and press Enter:

powercfg /batteryreport

Windows will generate a file called battery-report.html and tell you where it saved it — usually in C:\Users\[YourUsername]. The command takes a few seconds. Once it finishes, close the Command Prompt window.

Navigate to that folder using File Explorer, find battery-report.html, and double-click it to open the report in your web browser. The file is plain text formatted as a webpage, so it opens in whatever browser you have set as default.

What the battery report actually shows

The report displays three key numbers under the "Battery Information" section. Design Capacity is the milliwatt-hours (mWh) your battery was rated to hold when it left the factory. Full Charge Capacity is what it holds right now. Cycle Count is how many times the battery has charged from empty to full.

To find wear level, divide the Full Charge Capacity by the Design Capacity and multiply by 100. If Design Capacity is 50,000 mWh and Full Charge Capacity is 42,000 mWh, your battery is at 84 percent health — a wear level of 16 percent. Most manufacturers consider anything above 80 percent capacity acceptable for a laptop under warranty.

The report also shows recent battery usage over the last three days, including how long the laptop ran on battery power and how much time it spent charging. This helps you spot patterns — for example, if your laptop drains to 20 percent in two hours when it used to last six hours, the battery is failing even if the wear percentage looks moderate.

What battery wear levels mean for your laptop

A wear level under 10 percent is normal for a new or lightly used laptop. Between 10 and 20 percent means the battery is aging normally and has plenty of life left. At 20 to 30 percent wear, the battery is still functional but starting to show its age — you may notice the laptop runs for slightly less time than it did a year ago.

Above 30 percent wear, battery degradation becomes noticeable. Your laptop may shut down at 15 or 20 percent charge instead of running until the battery is truly empty, because the battery can no longer deliver power reliably at low states of charge. At 40 percent wear or higher, replacement is usually worth the cost, especially if you rely on the laptop away from a power outlet.

Wear level is not the only indicator — cycle count matters too. A battery with 800 cycles and 25 percent wear is degrading faster than normal and may fail sooner than one with 400 cycles and 25 percent wear. Age also plays a role: a battery sitting unused for two years will show wear even if the cycle count is low, because lithium degrades over time regardless of use.

Why battery health changes over time

Every time you charge a lithium battery, it loses a tiny amount of capacity. This is normal and unavoidable. A typical laptop battery is rated for 300 to 500 full charge cycles before it drops to 80 percent of its original capacity. Heat accelerates this process — a laptop that runs hot or sits in a warm room will degrade faster than one kept cool.

Leaving your laptop plugged in constantly also speeds up wear. Lithium batteries prefer to stay between 20 and 80 percent charge; keeping them at 100 percent for hours at a time stresses them. If you use your laptop mostly at a desk, unplugging it occasionally or using Windows 11's battery saver mode can extend its life.

Age alone causes degradation too. A battery that has been in your laptop for three years will show wear even if you have only charged it 200 times, because the chemical reactions inside slow down naturally over time. This is why a laptop battery that worked fine for two years may suddenly seem to drain faster in year three.

Other ways to check battery health in Windows 11

If Command Prompt feels unfamiliar, you can check basic battery information through Settings. Open Settings, go to System, then Battery. This screen shows your current charge percentage and battery saver mode options, but it does not show wear level or cycle count — only the Command Prompt method reveals those details.

Some laptop manufacturers include their own battery monitoring software. Dell has Dell Power Manager, Lenovo has Lenovo Vantage, and HP has HP Support Assistant. These tools sometimes show battery health in a simpler format than the Command Prompt report. Check your laptop maker's website to see if they offer a utility for your model.

Third-party tools like HWiNFO or BatteryInfoView can also read battery data, but the built-in Command Prompt method is faster and requires no installation. The information they show is the same — they just present it differently.

When to replace your laptop battery

Replace the battery if wear level exceeds 40 percent and you use the laptop away from power regularly. If you work at a desk and rarely move the laptop, even 50 percent wear may not bother you because you can plug in whenever the charge runs low. The decision depends on how you use the device.

Battery replacement costs vary by laptop model. A Dell or Lenovo battery typically runs $40 to $120 if you buy it yourself and install it, or $80 to $200 if you have the manufacturer do it. Some newer laptops have batteries glued in, making replacement difficult or impossible without professional help. Check your laptop's service manual or contact the manufacturer before assuming you can replace it yourself.

If your laptop is under warranty and the battery shows abnormal wear (more than 30 percent in under a year of normal use), contact the manufacturer about a replacement. Defective batteries are usually covered, though you may need to show proof of purchase.

Frequently Asked Questions

What if I cannot open Command Prompt as administrator?

Right-click the Start button, select Terminal (Admin) instead — it is the same tool with a newer interface. If a User Account Control window appears, click Yes to allow it to run. If you still see an error, your user account may not have admin rights; contact whoever set up the laptop.

Can I check battery health on a desktop computer?

No. The battery report only works on laptops with built-in batteries. Desktops do not have batteries to monitor, so the command will either fail or show no useful information.

How often should I check my battery health?

Once every six months is reasonable if you use the laptop daily. If you mostly work at a desk, checking once a year is enough. There is no harm in checking more often — the report takes seconds to generate.

Does the battery report show if my charger is broken?

No. The report only shows battery capacity and cycle count. If your laptop charges slowly or not at all, the problem could be the charger, the charging port, or the battery itself. Try a different charger if you have one; if that does not help, the port or battery likely needs service.

Will checking battery health drain my battery?

No. The Command Prompt command reads stored information about your battery — it does not run any tests or drain power. The report generates in seconds and uses almost no energy.