Glossary · 用語
Battery calibration.
Battery calibration is the process of re-aligning your MacBook’s charge gauge with the battery’s actual capacity. Modern Apple Silicon MacBooks calibrate automatically — manual calibration is unnecessary and can shorten lifespan.
The “drain to 0%, charge to 100%, leave for five hours” ritual you’ll find on older forums is left over from NiCd / NiMH chemistry that hasn’t shipped in a MacBook since 2008. Lithium-ion doesn’t suffer from memory effect and doesn’t need full discharges to estimate capacity.
On Apple Silicon (M1 and later), macOS continuously tracks individual cell behavior through battery firmware and corrects gauge drift silently. Manual calibration is only worth doing in two cases: right after replacing the battery, or on pre-2019 Intel MacBooks with a visibly stuck or wildly inaccurate meter.
Repeatedly draining a modern MacBook to 0% as a calibration habit just spends cycles for no benefit. If you’re reading a guide that recommends it, the guide is outdated.
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