Can you charge a MacBook Pro 16″ (M5 Pro/Max) with a Steam Deck 45W?
Worked out from the manufacturers’ specifications. Have a different charger? Pick it below the answer.
It charges, but at about 45 W — well below what the MacBook Pro 16″ (M5 Pro/Max) can take. Fine overnight or while idle; under heavy use the battery may still drain.
Estimated from the manufacturer’s stated fast-charge time, with the device idle.
Try another charger
How long to 50% with each charger
Shorter bar is faster. The highlighted row is the charger on this page.
Want it faster?
Full speed needs 140 W or more. These chargers get there:
MacBook Pro 16″ (M5 Pro/Max) charging specs
- Fast charging needs
- 140 W
- Max input (approx.)
- 140 W
- In the box
- 140W
- Battery
- 99.6 Wh
- Steam Deck 45W
- 45 W · USB-C
Sources: Apple: MacBook Pro (16-inch, M5 Pro or M5 Max) tech specs · Apple: Fast charge your MacBook Air or MacBook Pro · Steam Deck tech specs. Checked 2026-10-17.
Quick answers
Is it safe to charge the MacBook Pro 16″ (M5 Pro/Max) with the Steam Deck 45W?
Yes. USB Power Delivery negotiates power, so the MacBook Pro 16″ (M5 Pro/Max) 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 Pro 16″ (M5 Pro/Max) need for fast charging?
140 W or more. Fast-charge capable with a 140W or higher USB PD power source.
How long does the MacBook Pro 16″ (M5 Pro/Max) take to charge with the Steam Deck 45W?
About 1 h 15 min to 50% and 3 h 10 min to full, estimated with the device idle.