Can you charge a MacBook Air 15″ (M4) with an Apple 70W USB-C?
Worked out from the manufacturers’ specifications. Have a different charger? Pick it below the answer.
The Apple 70W USB-C meets the MacBook Air 15″ (M4)’s top charging speed of about 70 W.
Estimated from the manufacturer’s stated fast-charge time, with the device idle.
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How long to 50% with each charger
Shorter bar is faster. The highlighted row is the charger on this page.
MacBook Air 15″ (M4) charging specs
- Fast charging needs
- 70 W
- Max input (approx.)
- 70 W
- In the box
- 35W Dual
- Battery
- 66.5 Wh
- Apple 70W USB-C
- 70 W · USB-C
Sources: Apple: MacBook Air (15-inch, M4, 2025) tech specs · Apple: Fast charge your MacBook Air or MacBook Pro · Apple: 70W USB-C Power Adapter. Checked 2026-10-17.
Quick answers
Is it safe to charge the MacBook Air 15″ (M4) with the Apple 70W USB-C?
Yes. USB Power Delivery negotiates power, so the MacBook Air 15″ (M4) only takes what it can handle and the charger only gives what it can supply. A weaker charger is slower, not dangerous.
How many watts does the MacBook Air 15″ (M4) need for fast charging?
70 W or more. Fast-charge capable with the 70W USB-C Power Adapter.
How long does the MacBook Air 15″ (M4) take to charge with the Apple 70W USB-C?
About 30 min to 50% and 1 h 40 min to full, estimated with the device idle.