Ampere — Smart battery manager for Apple Silicon Macs
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For Apple Silicon · macOS 14+<br>Take charge of your battery.
Ampere lives in your menu bar, watches every watt, and keeps your<br>MacBook’s battery in the healthy zone — so it ages years slower.
Buy a license<br>Download free
brew install --cask az-code-lab/taps/ampere
Version 0.0.56 · Free to try · One‑time license, no subscription
Charging to 70% — then holds
94% health · 61 cycles
Everything your battery<br>wants you to know.
And every control it wishes you had. All two clicks away, all the time.
Live power telemetry
Adapter, battery, and system wattage. Voltages, currents, temperature, cycles, health, battery age — a dozen readouts, always current.
Charge bounds
Pick a healthy range like 40–60%. Ampere charges at the bottom of it, holds in the middle, and stops at the top. Automatically.
Micro-charge prevention
No fragmented top-ups — even across restarts. Between bounds, charging stays off until you ask, so every cycle runs full: lower to upper.
Charge & discharge on demand
One toggle tops you up to the upper bound. Another actively drains down to it — even with the charger plugged in.
Survives anything
Bounds and in-progress charges resume after a relaunch. If Ampere is ever force-killed, a watchdog restores your Mac’s defaults within seconds.
Verified in-app updates
Update right from the panel. Every download is verified against the Homebrew cask’s SHA-256 and Apple’s code signature before install.
Live menu-bar icon · hover for status<br>Sleep-safe charging<br>Pinnable panel<br>Launch at login<br>Periodic health checks
Built around<br>the healthy zone.
Lithium-ion cells age fastest parked at 100% or drained near empty.<br>Ampere keeps yours cruising in the band you choose — and never<br>wastes a charge cycle getting there.
Below your lower bound Charging starts, and runs all the way to the top of your range — closing the lid won’t cut it short or overshoot it.
Between bounds Ampere holds steady. No charging until you ask — or you dip below.
Above your upper bound Charging stays off — or actively discharge back down, even on AC power.
Auto charge
40%
60%
0%25%50%75%100%
Charging — holds at the upper bound
Safe by design.<br>Reversible by default.
Ampere touches low-level charge controls, so it’s built to leave no trace. Curious how, exactly? Read the full technical details →
Quit = clean slate
Closing Ampere restores every system default — charging, sleep, everything. Crash or force-kill? A root watchdog daemon cleans up within seconds.
A helper you can trust
Charge control runs through one tiny root helper, pinned to its SHA-256 digest in sudoers. A swapped or tampered binary is simply refused.
Always double-checking
Health checks continuously verify the hardware state matches what you asked for. If anything drifts, Ampere warns you and turns its icon orange.
Open source
MIT-licensed on GitHub. Read every line that touches your machine — or build it yourself. View the source →
Up and running<br>in a minute.
Install
brew install --cask az-code-lab/taps/ampere
or download Ampere.dmg and drag it to Applications.
Grant admin once
Ampere installs its charge-control helper with a single password prompt. That’s the last one you’ll see until the helper itself updates.
Set your bounds
Turn on auto charge, pick a range, and forget about it. Your battery takes it from here.
One license.<br>Yours forever.
Free to download and try for as long as you like. Buying a license registers your Mac and supports development.
Ampere License
$…one‑time
One key registers one Mac — move it to a new machine anytime
Key delivered instantly on screen and by email
Free updates, right in the app
14-day money-back guarantee
Macs
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Name
Email for your keys
Keys are delivered to this address and can only be registered with it — double-check it.
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Questions, answered.
macOS already has a charge limit. Why Ampere?<br>The macOS limit is a ceiling only, and it only goes from 80% to 100%. A ceiling parks the battery at the limit for as long as you stay plugged in, and time spent resting at a high charge level is what ages lithium-ion fastest. Apple’s own guidance for long-term storage is around 50%, a level the built-in limit can’t reach. Ampere holds a range instead: you choose both ends of the band, say 40 to 80%. Charging stays off while the battery drifts down to the lower bound, then runs one whole pass back to the upper. The battery lives at a lower average charge, in fewer, fuller cycles, in whatever band you choose. Set it once and stop thinking about the battery.
Which Macs does Ampere support?<br>Apple Silicon Macs (M1 and later) running macOS 14 Sonoma or newer. Intel Macs use different charge-control hardware and...