How to Check Laptop Battery Health in Windows 11 (UK Guide)

Introduction (direct answer)

To check laptop battery health in Windows 11, open Command Prompt as administrator and run powercfg /batteryreport. Open the battery-report.html file it creates and compare Full Charge Capacity with Design Capacity. Divide the first number by the second and multiply by 100. The result is your battery health percentage. Above 80 percent is healthy. Below 60 percent means you should plan a replacement soon.

What Laptop Battery Health Actually Means

Battery health is not the same as battery percentage. The percentage on your taskbar shows how much charge is left right now. Battery health shows how much charge the battery can hold at all, compared with when it was new.

Every lithium-ion battery wears out with use. Each charge cycle removes a small amount of capacity, and heat speeds up the wear. After two or three years of daily use, most laptop batteries hold noticeably less charge. A battery at 50 percent health drains fast and may shut the laptop down without warning.

This check tells you whether short battery life comes from a worn battery or from power-hungry apps.

Method 1: Generate the Windows Battery Report

The Windows battery report is the most detailed check available, and it is built into every copy of Windows 11. The whole process takes about a minute.

Right-click the Start button and choose Terminal (Admin) or Command Prompt (Admin). Click Yes if Windows asks for permission.
Type powercfg /batteryreport and press Enter.
Windows saves a file called battery-report.html in your user folder.
Open File Explorer, go to that folder and double-click battery-report.html. It opens in your web browser.

How to Read Your Battery Report

Scroll to the section called Installed batteries. Two numbers matter most. Design Capacity is the charge your battery could hold when it was new. Full Charge Capacity is the charge it can hold now. Both are shown in milliwatt-hours (mWh).

Use this formula:

Battery health (%) = (Full Charge Capacity / Design Capacity) x 100

For example, a battery designed for 60,000 mWh that now charges to 48,000 mWh is at 80 percent health.

Use these bands as a rough guide:

90 to 100 percent: excellent.
80 to 89 percent: good, with normal battery life.
70 to 79 percent: fair. You will notice shorter runtimes.
60 to 69 percent: poor. Plan a replacement.
Below 60 percent: replace the battery soon.

Some laptops do not report Cycle Count to Windows, and the field shows as a dash. Do not worry. The capacity ratio above is the number that matters most.

Method 2: Check Battery Health in Windows 11 Settings

For a quick check without a command line, open Settings and go to System, then Power and battery. Tap Battery usage to see which apps used the most power over the last 24 hours or the last 7 days.

On some newer laptops, the same page also shows a Battery health entry. Windows 11 does not show it on every laptop. When it is missing, use the battery report in Method 1.

This quick check can also spot a different problem. If battery health is fine but one app is eating 40 percent of your power, close or replace that app, not the battery.

Method 3: Use Your Laptop Brand App

This is the check most guides skip, and it is often the easiest one. Every major laptop brand ships its own support app, which shows battery health in plain language and cycle count where Windows does not.

Lenovo: open Lenovo Vantage, go to Device, then Power, for battery health, cycle count and a charge limit of 80 percent.
Dell: open Dell Power Manager and click Battery Information. It rates battery health as Excellent, Good, Fair or Poor.
HP: open HP Support Assistant, select Battery and click Run battery check.
ASUS: open MyASUS and look under Battery Settings for battery health and charging mode.
Acer: open Acer Care Center and check the battery section.
MSI: open MSI Center and check System Diagnosis.

Method 4: Check Battery Health in BIOS or UEFI

If Windows will not boot properly, check the battery in BIOS or UEFI. Restart your laptop and press the BIOS key as soon as it powers on: F2 for Dell, F10 for HP, F1 for Lenovo, Esc or F2 for ASUS. Inside BIOS, look for a section called Battery Health, Battery Information or Battery Status.

Ask the seller to show you the BIOS battery reading before you pay for a used laptop.

What Your Result Means: Replace or Keep Going

A low number does not always mean you must replace the battery today. Use this simple framework.

Keep using the battery if health is above 80 percent and the laptop still lasts through your normal working day. Turn on Energy Saver, lower screen brightness and close apps you do not need.

Plan a replacement if health is between 60 and 79 percent and the laptop no longer lasts a full meeting or a train journey. Start checking prices and warranty cover. If your laptop runs hot as well, dust in the fans may be making the problem worse. See our guide on how often to clean laptop fans before you blame the battery alone.

Replace the battery soon if health is below 60 percent, if the laptop shuts down at 20 or 30 percent charge, or if the battery or trackpad area feels swollen. A swollen battery is a safety issue. Stop using the laptop and get it replaced by a professional.

Check the cost first. A replacement battery for a common UK laptop model often costs between 40 and 90 pounds from a reputable supplier, plus fitting. If the laptop is old and slow in other ways, read our guide on how to make an old laptop faster first. That money may be better spent towards a replacement laptop.

UK Warranty and Your Rights

Before you pay for a battery, check whether someone else should pay. Most laptop makers give the battery a one-year warranty, often shorter than the warranty on the rest of the laptop. Check your purchase documents for the exact terms on your model.

Under the Consumer Rights Act 2015, goods must be of satisfactory quality and last a reasonable time. A battery that fails badly within its first year is usually covered. Keep your proof of purchase and the battery report as evidence if you make a claim.

How to Slow Battery Wear

You cannot stop battery wear, but you can slow it down. Keep the laptop cool, because heat is the biggest cause of wear. Do not leave it in a hot car or on a soft bed that blocks the vents. If your brand app offers a charge limit, set it to 80 percent for daily use.

Frequently Asked Questions

How do I check battery health on Windows 11 without installing software?

Run powercfg /batteryreport in Command Prompt or Terminal as administrator, then open the battery-report.html file. Compare Full Charge Capacity with Design Capacity. No download is needed.

What is a good battery health percentage for a laptop?

Above 80 percent is good for a laptop that is one to two years old. Below 60 percent means the battery is worn and you should plan a replacement.

How long should a laptop battery last?

Most laptop batteries keep good health for two to three years of normal daily use. Heavy use, heat and constant charging to 100 percent shorten that time.

Why does my battery report show no cycle count?

Some laptop firmware does not report cycle count to Windows, so the field shows as a dash. Use your laptop brand app, such as Lenovo Vantage or Dell Power Manager, to see it instead.

Is it safe to keep using a laptop with a swollen battery?

No. Stop using the laptop, do not charge it and do not press the battery. Take it to a professional repair service for safe replacement.

Conclusion

Checking laptop battery health in Windows 11 takes about a minute, and the built-in battery report gives you the clearest answer. Compare Full Charge Capacity with Design Capacity, work out the percentage, and use the bands in this guide to decide your next step.