How to Check Laptop Battery Health on Windows and Mac - Memeburn
TL;DR
- Windows users can generate a battery report using the powercfg /batteryreport command to compare the original capacity with the current full-charge capacity.
- MacBook users can check Battery Health in System Settings and view the cycle count through System Information.
- Battery health of 80% or higher can still be usable, but actual runtime, battery warnings, and your laptop manufacturer's guidance also matter.
- Replace your battery when wear affects daily use, especially if the laptop powers off unexpectedly, displays service warnings, or has a swollen battery.
Learning how to check laptop battery health offers you a clearer picture of your battery’s remaining capacity and performance. ASUS estimates that many lithium-ion laptop batteries retain about 80% of their original capacity after 300 charge cycles under normal conditions. We’ll walk you through four steps to check battery capacity, review its condition, and identify signs of wear on Windows and Mac.
How to Check Laptop Battery Health: Quick Answer
On Windows
- Search for Command Prompt and open it with administrator privileges.
- Enter powercfg /batteryreport and press Enter.
- Find the saved report location displayed in the command window, then open the HTML file.
- In the Installed Batteries section, compare Design Capacity with Full Charge Capacity to estimate how much of the battery’s original capacity remains.
On Mac
- Open the Apple menu and select System Settings.
- Choose Battery, then look for Battery Health if your Mac supports this option.
- Review the battery condition and maximum capacity when available.
- For cycle count information, open System Information, select Hardware, then Power, and locate Cycle Count.
How to Check Laptop Battery Health on Windows
If you’re also looking for a Friday laptop deal, checking battery health can help you assess a used or refurbished laptop before buying. Follow these four steps to check your battery’s condition.
Step 1: Open Command Prompt
Start by opening the Windows search panel and entering Command Prompt. Right-click the application in the results and choose Run as administrator. Approve the permission prompt if Windows displays one.
You can also use Windows Terminal with administrator privileges if that is the command-line application available on your computer. Either option can run the battery report command.
Step 2: Generate a Battery Report
Enter the following command into the command-line window:
powercfg /batteryreport
Press Enter to run it.
Windows will generate an HTML report containing battery usage and capacity information. The command is documented by Microsoft Learn
Step 3: Open the Battery Report
Open File Explorer by pressing Windows + E. Navigate to the folder listed in the command window and look for the generated battery report, usually named battery-report.html.
Double-click the file to view it in your default web browser. Because the report is stored on your computer, you do not need an internet connection to open it. If you cannot locate the file, run the command again and check the destination displayed after it finishes.
Step 4: Check Design Capacity and Full Charge Capacity.
Within the report, find the Installed Batteries section. Look for two values that help you estimate battery wear.
- Design Capacity: The battery’s rated capacity when new, as reported by the system.
- Full Charge Capacity: The maximum capacity the battery currently reports when fully charged.
Compare the two figures to estimate your battery’s remaining capacity relative to its original design.
How to Calculate Your Laptop Battery Health Percentage
You can calculate an estimated battery capacity retention percentage from the two values in your Windows report. Divide the full charge capacity by the design capacity, then multiply the result by 100.
Formula: Battery Health Percentage = (Full Charge Capacity ÷ Design Capacity) × 100
For example, suppose your report shows a design capacity of 50,000 mWh and a full charge capacity of 40,000 mWh.
Calculation: (40,000 ÷ 50,000) × 100 = 80%
Your battery retains approximately 80% of its original rated capacity. That means its reported capacity has decreased by about 20%.
What Does Your Battery Health Percentage Mean?
- 90–100%: Your battery retains most of its original capacity.
- 80–89%: Your battery has lost some capacity, but may still meet your daily needs.
- Below 80%: You may notice shorter battery life, especially during demanding tasks.
From our experience, battery health percentage is only part of the picture. If your laptop still lasts through your usual workday, you may not need a replacement immediately. However, if it drains quickly, shuts down unexpectedly, or displays a battery service warning, investigate further.
How to Check Battery Health on a MacBook
Check Battery Health in System Settings
- Click the Apple menu in the top-left corner of your screen.
- Open System Settings.
- Select Battery from the sidebar.
- Click the information button next to Battery Health, if available.
- Review the displayed condition and maximum capacity, if your Mac shows them.
Apple notes that the exact options available can vary by Mac model and macOS version. If you don’t see the Battery Health option, check your battery’s status through System Information.
Check Your MacBook Battery Cycle Count
- Hold down the Option key on your keyboard.
- Click the Apple menu in the top-left corner.
- Open System Information.
- In the Hardware section, select Power.
- Locate Cycle Count under Battery Information.
A battery cycle represents using a total of 100% of the battery’s capacity, even when that usage happens across multiple charges. For instance, using 50% of your battery on Monday and another 50% on Tuesday adds up to one cycle, according to Apple Support.
What Is a Good Laptop Battery Health Percentage?
A good laptop battery health percentage is generally 90% or higher, although a battery below 90% can still work well. According to Apple, Mac laptop batteries retain up to 80% of their original capacity after reaching their maximum rated cycle count. When learning how to check laptop battery health, use your capacity percentage as a guide rather than a strict replacement rule. Similarly, Microsoft’s Surface Laptop guidance recommends considering battery replacement when capacity falls below 70% of its original design capacity.
These are general guidelines, not universal industry thresholds. Microsoft, for example, says Surface users can choose to replace a battery when its capacity falls below 70% of its original design capacity.
When Should You Replace Your Laptop Battery?
You should replace your laptop battery when it no longer holds enough charge for your daily needs, shows a battery service warning, or develops signs of physical damage. A lower battery health percentage alone doesn’t always mean you need a replacement.
When learning how to check laptop battery health, look for these warning signs:
- Battery health falls significantly: If your battery capacity drops considerably, you may notice shorter runtime.
- Your laptop drains unusually fast: If a full charge no longer lasts through your normal workday, battery wear may be affecting your routine.
- Laptop displays a service warning: On a MacBook, a Service Recommended message indicates that the battery holds less charge than when new or may not be functioning normally.
- The battery is swollen: A bulging laptop case, raised trackpad, or keyboard that no longer sits flat may indicate battery swelling.
- Your laptop shuts down unexpectedly: If it switches off even when the battery indicator shows charge remaining, the battery may be deteriorating.
How to Keep Your Laptop Battery Healthy
- Avoid excessive heat and direct sunlight.
- Use your laptop’s battery charging limit feature, if available.
- Avoid regularly draining the battery to 0%.
- Keep your operating system and drivers updated.
- Reduce screen brightness when possible.
- Enable Battery Saver or Energy Saver when needed.
FAQs
How do I test the battery health of my laptop?
On a Windows laptop, create a battery report by running powercfg /batteryreport in Command Prompt. Open the report to see how the battery’s current full-charge capacity compares with its original design capacity. For a MacBook, check the Battery Health information in System Settings, or open System Information and navigate to Hardware, then Power, to find the cycle count.
Is a 92% battery health good?
Yes, 92% generally indicates good capacity retention. It means the battery retains approximately 92% of its original design capacity. However, manufacturers don’t use one universal threshold for every laptop, so check your device’s battery condition and actual runtime.
How long should 100% battery last on a laptop?
There is no single number of hours that applies to every laptop. Runtime depends on the model, battery size, screen brightness, applications, and workload. Check your manufacturer’s advertised battery life, then compare it with your actual usage.
Is 72% battery health good for a laptop?
72% indicates a noticeable capacity loss, meaning the battery holds substantially less charge than it did when new. You may need to recharge more often, but replacement depends on your laptop’s performance and the manufacturer’s guidance.