Can you charge a Galaxy S25 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 needs a charger with PPS, which the Steam Deck 45W doesn’t support.
Estimated from the official battery capacity and the power this pair agrees on, 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 25 W or more with PPS. These chargers get there:
Galaxy S25 charging specs
- Fast charging needs
- 25 W + PPS
- Max input (approx.)
- 25 W
- Battery
- 4,000 mAh
- Steam Deck 45W
- 45 W · USB-C
Sources: Samsung: Galaxy S25 | S25+ specs · Samsung: Compare Galaxy S25 series · Belkin: Galaxy S25 charging guide · Samsung: Enable fast charging (PPS requirement) · Steam Deck tech specs. Checked 2026-10-17.
Quick answers
Is it safe to charge the Galaxy S25 with the Steam Deck 45W?
Yes. USB Power Delivery negotiates power, so the Galaxy S25 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 need for fast charging?
25 W or more, from a USB-C PD charger that supports PPS. Super Fast Charging needs a USB PD charger with PPS.
How long does the Galaxy S25 take to charge with the Steam Deck 45W?
About 36 min to 50% and 1 h 45 min to full, estimated with the device idle.