LiwuMac's Built-In Charge Limit vs a Charge-Limit App
Published · Liwu behavior checked against 2.7.0 ()
If 80% and nothing more is what you want, the Charge Limit built into macOS Tahoe 26.4 and later is enough, and you do not need another tool for it. A charge-limit app earns its place when you want a target below 80%, a wider range before recharging, a full charge on a schedule, or a clearer view of what the battery and the charger are doing.
Verified: Apple documentation and Liwu 2.7.0 behavior checked October 8, 2026.
| You want | Built-in Charge Limit | Liwu |
|---|---|---|
| A limit from 80% to 100% | Yes | Yes, by setting that same system limit |
| A limit below 80% | No | 20–79% on Macs that pass a capability check |
| A full charge when you need one | Charge to Full Now | Top Up, by hand or on a schedule (Pro) |
| How far the level falls before recharging | More than 5%, not adjustable | 5–20 percentage points, your choice (Pro) |
| Changes at a set time | No | Plans for targets, Top Up, and calibration (Pro) |
| Live adapter and battery power | Not shown in the battery menu | Shown in the battery bar |
| Battery health over time | Not charted | A daily record, charted |
| A low-battery warning | At a level macOS sets | At a level you choose, also for accessories that report one |
When the built-in limit is all you need
Use Apple's Charge Limit, and nothing else, when all of these are true:
- Your Mac has Apple silicon and runs macOS Tahoe 26.4 or later.
- A target between 80% and 100% suits you.
- You are comfortable with how macOS applies it: it charges to within a few percentage points of the limit, resumes once the battery has dropped more than 5% while connected to power, and occasionally charges to 100% to keep its charge estimate accurate.
Setting it takes a minute: System Settings → Battery, the information button next to Charging, then a limit between 80% and 100%. The steps and the differences from Optimized Battery Charging are in Optimized Battery Charging and Charge Limit, explained.
What an app adds
The examples below describe Liwu 2, which supports Apple silicon MacBooks on macOS 26.7 or later.
A target below 80%
Apple's lowest setting is 80%. Liwu offers 20–79% on Macs that pass a capability check when it starts; where support is missing or cannot be confirmed, the minimum stays at 80% and Liwu says so.
Targets in this range work differently from the ones above them. They use firmware controls, they can actively discharge the battery toward the target while the Mac is plugged in, and they follow raw battery capacity, which can differ from the percentage macOS displays by a few points.
Whether a lower target is worth it depends on how the Mac is used. A Mac that leaves the desk a few times a year has little use for the charge between 60% and 80%. Apple publishes no figures for what a lower target saves, so treat it as a preference, not a guarantee. What charge limit to use when a MacBook is plugged in all day goes through the choices.
A range of your choosing
The built-in limit already works as a narrow range: charging stops near the limit and resumes after a drop of more than 5%. Sailing, in Liwu Pro, lets you set that drop anywhere from 5 to 20 percentage points, with the lower end never below 20%. A wider range means fewer small recharges and a larger swing. It needs the same firmware support as low targets, even when the limit itself is 80% or higher.
A full charge on your terms
Charge to Full Now in the battery menu covers the day you need 100%. Top Up, in Liwu Pro, does the same from Liwu and keeps your regular target, returning to it when you turn Top Up off or unplug. A plan can start Top Up at a time you set, once or on a repeating schedule, provided the Mac is awake, Liwu is running, and power is connected at that moment.
Seeing what is happening
A limit raises questions the battery menu does not answer. Is the battery charging right now, or is the adapter only powering the Mac? Has capacity changed since last month?
- The battery bar shows adapter input and battery charging or discharging power separately.
- Battery health history records maximum capacity and cycle count once a day while Liwu runs, and charts them. The readings stay on your Mac.
- You choose the level at which Liwu warns you about a low battery, and it does the same for accessories that report their battery level to macOS.
These three are free.
Calibration and plans
Liwu Pro includes a five-step cycle (charge to full, discharge to 10%, recharge, hold for an hour, return to your regular target) that you start yourself or schedule. It requires connected power and supported low-target control. It does not restore lost capacity. Plans can also change the regular target at set times.
What an app does not change
- At 80% and above, macOS still decides. Liwu sets the system's own Charge Limit for these targets. The tolerance of a few points and the occasional automatic charge to 100% remain. See why a MacBook charges past the limit.
- It is not a lifespan promise. Apple says battery aging depends on a combination of factors, including temperature history and charging pattern. A limit reduces time spent at a high charge; it does not remove the other factors.
- It adds a privileged component. Charging control runs through a signed helper with system access. Before approving one, from any developer, go through the charge limiter safety checklist.
- One controller at a time. Do not run two charging tools together, and keep Optimized Battery Charging off while Liwu manages charging.
How to decide
- If your Mac runs Tahoe 26.4 or later and 80% is the target, start with the built-in Charge Limit. It costs nothing and installs nothing.
- If you find yourself wanting a lower target, a wider range, a scheduled full charge, or power readings and history, that is the point at which an app is worth installing.
- If your Mac cannot run Tahoe 26.4, the built-in limit is not available and a third-party limiter is the only way to hold a fixed target. For Liwu, the legacy page covers older systems.
FAQ
Do I still need a charge-limit app on macOS Tahoe?
Not for a plain 80–100% limit. The built-in Charge Limit does that on Apple silicon Macs running Tahoe 26.4 or later. An app is for what the built-in setting does not offer: targets below 80%, an adjustable range, scheduled changes, and more detail about power and battery health.
Can I use the built-in Charge Limit and Liwu together?
For targets of 80% and above they are the same setting: Liwu sets the system's Charge Limit, and if you change it in System Settings, Liwu adopts the new value as your target. With a target below 80%, System Settings shows 100%; that is normal in this mode and should be left alone. If the system and Liwu's record stop matching there, Liwu pauses its own changes and tells you what to check.
Is a limit below 80% better for the battery?
Apple's built-in feature stops at 80% and Apple publishes no figures for lower targets. A lower target reduces time at a high charge and costs unplugged runtime. It suits a Mac that rarely leaves power, and it is a preference, not a measured result.
What is free and what is paid in Liwu?
Charging targets, including those below 80% on supported Macs, presets, power readings, battery health history, and alerts are free. Top Up, Sailing, calibration, and plans are part of Liwu Pro, a one-time purchase.