Show your battery percentage before a flight

You're at the gate with a six-hour flight ahead, no guaranteed seat power, and a battery icon that only tells you "some." Before you board, make the exact charge visible: System Settings → Control Center → Battery → Show Percentage. Now a glance tells you whether you're starting the flight at 92% or a nervier 58% — the difference between watching two films and rationing every minute.

Turn on the number at the gate

It takes fifteen seconds, and it works the same on macOS 13 Ventura, 14 Sonoma, and 15 Sequoia:

1. Open System Settings.
2. Click Control Center in the sidebar.
3. Scroll to Battery.
4. Turn on Show Percentage.

The exact figure appears inside the battery icon in the menu bar right away — no restart, so you can do it in the boarding line. If you'd rather flip it from the Terminal before you pack up, the same setting is one command with its reversal beside it:

# Show the percentage, then relaunch Control Center
defaults write com.apple.controlcenter BatteryShowPercentage -bool true
killall ControlCenter

# Undo — hide the number
defaults write com.apple.controlcenter BatteryShowPercentage -bool false
killall ControlCenter

Read the number the way a traveller should

A percentage is only half the picture on a plane — what you really want to know is how long that charge will last at what you're doing. Open Control Center → Battery from the menu bar to see which apps are drawing the most power; a video call or a build running in the background will drain a full battery in a fraction of the time a text editor will. Watching the percentage tick down over the first twenty minutes gives you a real burn rate to plan the rest of the flight around.

A note on trust: the number is your Mac's live estimate and it recalibrates constantly, so a small early jump after you unplug is normal. Judge your runway by the trend over several minutes, not a single reading the moment you pull the charger.

Stretch the charge you can see

Once the percentage is on screen, you can actively manage it. Turning on Low Power Mode for the flight throttles background activity and dims the display to make a given percentage go noticeably further:

• Open System Settings → Battery and set Low Power Mode to Only on Battery — it kicks in automatically the moment you unplug.
• Dim the screen a few notches; the display is usually the single biggest drain on a laptop.
• Quit anything syncing or downloading before takeoff so it isn't working against you at cruising altitude.

With the percentage visible and Low Power Mode on, you can watch a smart 5% saving turn into another half-hour of usable time — and land with charge to spare.

Make Low Power Mode do the heavy lifting

The percentage tells you where you stand; Low Power Mode is how you make it last. Our guide on using Low Power Mode on Mac covers when to switch it on and exactly what it changes to save charge.