Somewhere in your laptop, a counter is ticking. Every time you use a full battery's worth of charge — whether in one go or spread across days — that counter goes up by one.
That number is your cycle count, and it's the most honest indicator of how much life your battery has left.
What counts as one cycle
A cycle isn't "one charge." It's one full battery's worth of discharge.
If you drain from 100% to 50%, plug in, charge back to 100%, then drain to 50% again — that's one cycle. Two half-discharges equal one full cycle.
This means light users might accumulate 100-200 cycles per year, while heavy users might hit 300-400.
How to check yours
Windows:
Open a terminal and run:
powercfg /batteryreport
Open the generated HTML file and look for "Cycle Count" in the battery information section.
macOS:
Apple menu → About This Mac → More Info → System Report → Power. The cycle count is listed under "Health Information."
Or use Battery Notifier — the health dashboard shows cycle count alongside capacity, temperature, and wear progression in one view.
When to worry
| Cycle count | What it means |
|---|---|
| 0–300 | Healthy. No action needed. |
| 300–500 | Normal wear. You might notice slightly shorter runtime. |
| 500–800 | Aging. Capacity is likely below 80% of original. |
| 800–1000 | End of life for most batteries. Consider replacement. |
| 1000+ | Apple considers MacBook batteries "consumed" at this point. |
These ranges vary by manufacturer. Apple rates MacBook batteries for 1000 cycles. Most Windows laptops are rated for 300-500 (Dell's guide on battery reports covers how to check).
Can you reset it?
No. The cycle count is stored in the battery's controller chip, not in your operating system. Replacing the battery resets the count because you're getting a new chip.
Does a high cycle count mean a bad battery?
Not necessarily. A battery at 500 cycles that was kept between 20-80% will be healthier than one at 300 cycles that was drained to 0% and charged to 100% daily.
As Battery University explains, cycle count tells you how much the battery has been used. Capacity percentage tells you how much damage that use caused. Both numbers together give you the full picture.
The one number that matters more
If you only check one thing, check maximum capacity (or "full charge capacity" vs "design capacity"). That tells you how much runtime you've actually lost, regardless of cycle count.
Battery Notifier's health dashboard tracks both — so you can see the trend over time instead of checking once and guessing.