How to Check Laptop Battery Health (Windows & Mac)

By Jayadeep · Updated June 2026

Quick answer: To check laptop battery health, compare its current full-charge capacity to its original design capacity. On Windows, run a battery report from the command line; on Mac, check Battery Health in settings. Below about 80% after a couple of years is normal wear.

For a quick live look at charge level and charging status, open the battery test.

Check battery health on Windows

Open Command Prompt and run powercfg /batteryreport. It saves an HTML file (the path is shown); open it and compare Full Charge Capacity with Design Capacity. The gap is your wear, and the report also shows the cycle count and recent usage.

Check battery health on Mac

Go to System Settings → Battery → Battery Health (or hold Option and click the battery icon on older versions). It shows a status of Normal or Service Recommended, and the cycle count appears in System Information under Power.

What counts as a healthy battery?

Health is the ratio of current capacity to the original design capacity. Around 80%+ is healthy; most batteries reach roughly 80% after a few hundred charge cycles, which is expected wear rather than a fault. Mac laptops are typically rated near 1,000 cycles.

When to replace the battery

Consider a replacement when capacity drops well below 80%, the laptop dies far sooner than it used to, it shuts down suddenly at moderate charge, or the battery is physically swollen — stop using a swollen battery and have it serviced.

Quick live check

The browser battery test shows what your browser reports — charge level and whether you are plugged in — where the device and browser expose it.

Why Battery Health Matters

Every rechargeable battery wears down over time, holding less charge than when it was new — this is normal and unavoidable. Battery health is a measure of how much capacity remains compared with the original design capacity, expressed as a percentage. A battery at 90% health holds about 90% of what it once did; one that's dropped to 70% will run noticeably shorter on a charge. Checking your battery's health tells you whether short run-times are down to wear, whether a replacement is worth considering, and how your charging habits are affecting it over time. Both Windows and macOS have built-in ways to see it.

Checking Battery Health on Windows 11

Windows 11 24H2 doesn't show battery health in Settings, but it generates a detailed report through a command. Open Command Prompt or Windows Terminal and type powercfg /batteryreport, then press Enter. Windows saves an HTML report to your user folder and tells you the exact path. Open that file and look for two figures: Design Capacity (what the battery held when new) and Full Charge Capacity (what it holds now fully charged). Dividing the full-charge figure by the design figure gives your battery health percentage. The report also shows your battery's recent usage and capacity history over time, which reveals how quickly it's degrading.

Checking Battery Health on macOS

On macOS Sequoia, it's more direct: go to System Settings → Battery, then click the small information (i) icon next to Battery Health. You'll see a status such as "Normal" and, on recent versions, a maximum capacity percentage. macOS also offers Optimized Battery Charging, which learns your routine and holds the charge below 100% until you need it, to slow wear. The cycle count — how many full charge-discharge cycles the battery has been through — is another useful number, viewable in System Information under Power; batteries are rated for a certain number of cycles before capacity is expected to drop meaningfully.

When to Replace and How to Prolong It

As a rough guide, once a battery falls to around 80% health or below, or you're getting frustratingly short run-times, it's worth considering a replacement — and many manufacturers consider significant capacity loss within the warranty period a valid claim. To prolong battery life, avoid keeping it at extremes: regularly draining to 0% or sitting at 100% for long periods both add wear, so keeping it roughly between 20% and 80% is gentler. Heat is a battery's enemy, so avoid leaving a laptop charging in hot places or blocking its vents. Use optimised or limited charging features if your laptop offers them. None of this stops wear entirely — it's a normal part of a battery's life — but good habits meaningfully slow it down. Our battery test helps you observe how your battery discharges in real use.

Understanding Cycle Counts and Wear

A charge cycle is one full discharge and recharge worth of capacity — but it doesn't have to happen in one go. Using half your battery, recharging, and using half again the next day counts as a single cycle, not two. This matters because batteries are rated for a number of cycles (often several hundred to around a thousand on modern laptops) before their capacity is expected to drop noticeably, so the cycle count is a good gauge of how much life a battery has used up. You can find it in the Windows battery report and in macOS System Information. A laptop with a low cycle count but poor health may have been damaged by heat or sitting at full charge, while a high cycle count with decent health simply reflects heavy but healthy use. Occasionally letting the battery run down and recharge fully can also help the system recalibrate its capacity estimate so the percentage shown is accurate.

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