Can you charge a Galaxy S25 Ultra with a Steam Deck 45W?
Worked out from the manufacturers’ specifications. Have a different charger? Pick it below the answer.
It charges at normal speed. For the fastest speed the Galaxy S25 Ultra needs a charger with PPS, which the Steam Deck 45W doesn’t support.
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 45 W or more with PPS. These chargers get there:
Galaxy S25 Ultra charging specs
- Fast charging needs
- 45 W + PPS
- Max input (approx.)
- 45 W
- Battery
- 5,000 mAh
- Steam Deck 45W
- 45 W · USB-C
Sources: Samsung: Galaxy S25 Ultra specs · Samsung: Compare Galaxy S25 series · SamMobile: Galaxy S25+/Ultra 45W charging · Samsung: Enable fast charging (PPS requirement) · Steam Deck tech specs. Checked 2026-10-17.
Quick answers
Is it safe to charge the Galaxy S25 Ultra with the Steam Deck 45W?
Yes. USB Power Delivery negotiates power, so the Galaxy S25 Ultra 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 Galaxy S25 Ultra need for fast charging?
45 W or more, from a USB-C PD charger that supports PPS. Super Fast Charging 2.0 (45W) works with the bundled 3A cable and a 45W PPS charger.
How long does the Galaxy S25 Ultra take to charge with the Steam Deck 45W?
About 39 min to 50% and 1 h 40 min to full, estimated with the device idle.