Can you charge an ROG Xbox Ally X20 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 ROG Xbox Ally X20 can take. Fine overnight or while idle; under heavy use the battery may still drain.
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 68 W or more. These chargers get there:
ROG Xbox Ally X20 charging specs
- Fast charging needs
- 68 W
- Max input (approx.)
- 68 W
- In the box
- 68W (varies by region)
- Battery
- 80 Wh
- Steam Deck 45W
- 45 W · USB-C
Sources: ASUS: ROG Xbox Ally X20 (2026) specs · ASUS press release: ROG Xbox Ally X20 available · Steam Deck tech specs. Checked 2026-10-17.
Quick answers
Is it safe to charge the ROG Xbox Ally X20 with the Steam Deck 45W?
Yes. USB Power Delivery negotiates power, so the ROG Xbox Ally X20 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 ROG Xbox Ally X20 need for fast charging?
68 W or more. Comes with a 68W USB-C adapter (20V 3.4A) where included; Travel Mode limits charging to 65W.
How long does the ROG Xbox Ally X20 take to charge with the Steam Deck 45W?
About 1 h 5 min to 50% and 3 h 5 min to full, estimated with the device idle.