Check Battery Health on Mac

  1. 1

    Quick check: Option + click battery icon

    Hold the Option key and click the battery icon in the menu bar. The condition appears: Normal, Replace Soon, Replace Now, or Service Battery. Normal means the battery is healthy. Any other status warrants attention.

  2. 2

    Detailed check via System Information

    Hold Option, click the Apple menu → System Information → Power section. Look for Cycle Count (how many full charge cycles the battery has completed) and Full Charge Capacity vs Design Capacity. MacBook batteries are rated for 1,000 cycles before noticeable degradation.

  3. 3

    Check battery health percentage (macOS Sonoma+)

    System Settings → Battery → Battery Health → click the i button. Shows current maximum capacity as a percentage of original. 80% or above is healthy. Below 80% is when Apple considers a replacement worth considering.

Check Battery Health on Windows

  1. 4

    Open Command Prompt as administrator

    Search for cmd → right-click → Run as administrator.

  2. 5

    Run the battery report command

    Type powercfg /batteryreport /output "C:attery-report.html" and press Enter. Windows generates a detailed battery report.

  3. 6

    Open the report

    Open File Explorer → C: drive → find battery-report.html → open in a browser. Look for Design Capacity vs Full Charge Capacity. If your Full Charge Capacity is significantly lower than Design Capacity, the battery has degraded. Example: design 50,000mWh, current 38,000mWh = 76% health.

What cycle count meansA charge cycle is one full 0–100% charge. Using 50% and recharging to 100% twice counts as one cycle. Most laptop batteries last 500–1,000 cycles before noticeable degradation. Check your laptop manufacturer's rated cycle count.

Improving Battery Life

  • Keep battery between 20–80% charge where possible — deep discharge and constant 100% both accelerate degradation
  • Use optimised charging if available (Mac and some Windows laptops learn your schedule and slow charging to 80% until needed)
  • Avoid leaving the laptop plugged in at 100% for extended periods
  • Keep the laptop cool — heat is the biggest enemy of lithium batteries

Frequently Asked Questions

When it no longer lasts long enough for your needs. As a guide: below 80% of original capacity, or if you are getting less than half the original battery life. MacBooks show a Replace Battery notification when Apple considers replacement appropriate. Third-party battery replacements are available for most laptops at a fraction of the cost of manufacturer service.
Modern laptops have charging circuits that stop charging at 100% — they do not continue pushing current into a full battery. However, keeping a battery at 100% for extended periods does cause slightly faster long-term degradation compared to maintaining 20–80%. Most manufacturers now offer optimised charging settings to address this.