Low Power Mode is the single fastest way to stretch a MacBook's battery when you're away from an outlet. It trades a little performance for a lot more runtime, and it takes about five seconds to turn on. Here's exactly how to enable it, what it changes, and when it's worth using.
How to turn on Low Power Mode
Low Power Mode lives in System Settings on any MacBook running macOS Monterey (2021) or newer:
- Click the Apple menu → System Settings (called System Preferences on older macOS).
- Click Battery in the sidebar.
- Find Low Power Mode and choose when it should run.
On recent versions of macOS you get three choices instead of a simple on/off switch:
- Never — Low Power Mode stays off.
- Only on Battery — kicks in automatically the moment you unplug, and turns itself off when you plug back in. This is the setting most people want.
- Only on Power Adapter — runs only while plugged in (useful if you want a cooler, quieter machine on your desk).
- Always — on no matter what.
There's no menu-bar toggle for it, but "Only on Battery" means you rarely need one — your Mac manages it for you.
What Low Power Mode actually changes
Low Power Mode doesn't cripple your Mac. It makes a handful of quiet adjustments that add up to noticeably longer battery life:
- Lowers the processor's peak clock speed so it sips less power under load. Everyday tasks — email, web, documents, video — feel the same.
- Reduces the display's refresh rate on ProMotion MacBook Pro models (from 120Hz down to 60Hz), which saves a surprising amount of power.
- Dims the display slightly and eases back on background activity like automatic updates and syncing.
Apple's own estimates put the battery gain in the range of an extra hour or two on a typical laptop, depending on the model and what you're doing. You'll feel the trade-off only in heavy work — exporting video, compiling code, gaming — where the capped clock speed slows things down.
When to use it (and when not to)
Turn it on when:
- You're traveling or in a meeting with no outlet nearby.
- Your battery is getting older and doesn't last like it used to.
- You just need the machine to survive until the end of the day.
Leave it off when:
- You're doing performance-heavy work (video export, 3D, large builds) and you're plugged in anyway.
- You need every bit of speed and battery isn't a concern.
The "Only on Battery" setting handles both cases automatically, which is why it's the setting we recommend for almost everyone.
Low Power Mode won't fix a worn-out battery
Low Power Mode helps a healthy battery go further — it can't rescue one that's near the end of its life. If your MacBook dies fast even with Low Power Mode on, dims unexpectedly, or shows Service Recommended, the battery itself is likely the problem. Start with our MacBook battery health guide to check your cycle count and condition, and if the Mac also feels sluggish, our MacBook running slow walkthrough covers the software fixes worth trying first.
When a battery replacement costs more than the machine is worth, upgrading is often the smarter move. Every Mac in our Apple clearance lineup ships with a verified-healthy battery and its cycle count listed up front — a MacBook Air M1 starts at $450 and an M2 at $549, both with far more runtime than a tired older laptop, Low Power Mode or not.
Frequently asked questions
Does Low Power Mode make my Mac slower?
Only under heavy load. It caps the processor's peak speed, so intensive tasks like video export or gaming run a bit slower. Everyday use — browsing, email, documents, streaming — feels the same.
Is it safe to leave Low Power Mode on all the time?
Yes, it's completely safe. There's no downside to running it constantly other than slightly reduced peak performance. Many people set it to "Only on Battery" so it's on when it helps and off when it doesn't.
Why don't I see Low Power Mode on my Mac?
It requires macOS Monterey (2021) or newer. On a Mac desktop like an iMac or Mac Mini, you may see fewer options since there's no battery to preserve. Update macOS from System Settings → General → Software Update if the option is missing on a laptop.
Does Low Power Mode help charge my Mac faster?
No — it's about extending runtime on battery, not charging speed. If your Mac won't charge at all, that's a separate issue.
How much battery does Low Power Mode actually save?
Typically an extra hour or two of use, depending on your model and workload. ProMotion MacBook Pros gain the most because dropping from 120Hz to 60Hz saves significant power.
Shopping for a Mac that already lasts all day? Browse our Apple clearance deals — every listing shows the real battery cycle count before you buy.