Kombucha
Limit MacBook charging to extend battery lifespan
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Kombucha - Limit MacBook charging to extend battery lifespan

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A MacBook that stays on its adapter spends its life at 100%, where a lithium-ion cell ages fastest. Kombucha holds the battery inside a range you choose: it stops charging at the upper threshold and resumes at the lower one, so the Mac runs from the adapter while the battery rests. Also: Charge to 100% Once, Heat Protection, discharge to the limit, history charts, battery health. Free and open source (MIT), no network access or telemetry. Apple Silicon, macOS 15–26.

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Hi everyone! I made Kombucha, a small menu bar app that keeps a MacBook's battery inside a charge range you choose (default 80% stop / 75% resume), so a Mac that lives on its adapter doesn't sit 100%. My MacBook sits on the adapter all day, and I wanted a free, open-source way to keep the battery healty. What it does: - Stops charging at your upper limit and resumes at the lower one - Charge to 100% Once when you need a full battery for a trip - Heat Protection: pauses charging at 40 °C - Discharge to the limit with the cable still plugged in - 7- and 30-day history, battery health, notifications, Shortcuts It's free and open source (MIT). A small helper writes only two SMC keys, and the app has no network access, accounts or telemetry. Install with Homebrew (brew install --cask askuksov/tap/kombucha) or the notarized download on GitHub. It works on Apple Silicon MacBooks with macOS 15–26. I'd love feedback: does it hold the limit on your Mac, and what's missing?