MacBook Air M4 battery percentage jumping and freezing

Hi! Battery percentage jumping and freezing on a MacBook Air M4 is a known calibration and SMC issue. Here are some targeted steps beyond the warranty suggestion:

1. Reset the SMC (System Management Controller):

- Shut down your MacBook completely

- Press and hold Control + Option + Shift (left side) + Power button for 10 seconds

- Release all keys, then press Power to start normally

- The SMC controls battery readings and this often fixes the frozen percentage

2. Recalibrate the battery:

- Charge to 100% and keep it plugged in for 2 more hours

- Then unplug and use it until it shuts off automatically

- Charge back to 100% without interruption

- This resets the battery gauge firmware

3. Reset NVRAM/PRAM:

- Restart and immediately hold Option + Command + P + R

- Hold for about 20 seconds until you hear a second startup chime (or the Apple logo appears twice)

- Release and let it boot normally

4. Check Battery Health:

- Go to System Settings → Battery → Battery Health

- If it shows "Service Recommended", you qualify for a free battery replacement under warranty

5. Run Apple Diagnostics:

- Shut down, hold the Power button until "Loading startup options" appears

- Hold Command + D to run diagnostics

- This will flag any hardware battery faults

Since this is under 1 year old, if the issue persists after these steps, request a Genius Bar appointment and reference the battery percentage jumping as a defect — Apple typically covers this under AppleCare or standard warranty. Good luck!

Does your Mac freeze up using AC adapter? If so then you may have a software issue. If still under the one year then should be covered under warranty.