What is a cycle?
One full discharge from 100% to 0% — can be split across days.
Apple's rating
MacBook batteries are rated to 1,000 cycles before reaching 80% capacity.
Grades we use
- Under 300 — Grade A (Excellent)
- 300–500 — Grade B (Good)
- 500–800 — Grade C (Fair)
- 800+ — battery replacement recommended
How to check
System Settings → Battery → Battery Health → ⓘ → Cycle Count.