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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.
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?
No comment highlights available yet. Please check back later!
About Kombucha on Product Hunt
“Limit MacBook charging to extend battery lifespan”
Kombucha was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #114 on the daily leaderboard. 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.
Kombucha was featured in Mac (103.9k followers), Productivity (665.4k followers), Open Source (69.1k followers) and GitHub (41.5k followers) on Product Hunt. Together, these topics include over 241.8k products, making this a competitive space to launch in.
Who hunted Kombucha?
Kombucha was hunted by Aleksandr Kuksov. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Aleksandr Kuksov