Glossary · 用語
Charge cycle.
A charge cycle is the full equivalent of using 100% of your battery’s capacity, in any combination. Two days at 50% drained each equals one cycle. Five days at 20% equals one cycle.
“Charge cycle” gets confused with “plug-in event” constantly. They’re unrelated. Plugging in five times in one day adds zero cycles if you barely used the battery. Using 80% of capacity over one long meeting then charging fully adds 0.8 cycles.
macOS tallies fractional cycles in battery firmware, so you never see the decimals — the headline cycle count rounds when it ticks over to the next integer.
Cycles count toward the battery’s rated lifetime, but the real wear comes from heat and time at high state of charge. A charge limit at 80% doesn’t directly slow cycle accumulation; it reduces voltage stress per cycle, so capacity stays above the 80% Service Recommended threshold for more cycles total.
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