Negotiated Charging Values?

[xSOSxHawkens]

Howdy,

Trying to figure out some charger options for the deck and how long each might take. A bit of a preface that I have a good bit of cross experience with RC Aviation and so am well versed in battery charging, discharging, and charge rates.

Using the "watch sensors" command in Desktop Mode reveals that the deck appears to only have two charge modes?

15v @ 3a* for 45w total input on PD3.0 bricks or Stock PSU.
5v @ 1.5a for 7.5w total input on all other types - Negotiated but not actually showing live detection of current, known 5v-0.5a charge ports show as the same in watch sensors, so it will not actually show an active 0.5a as 0.5a measured.

This is frankly quite disappointing. Not only do we not seem to get any options outside these two, but it seems to not display actual charge rate only negotiated. I have tested this with 5v units ranging from 0.5a to 2.5a.

At least one portable power bank I have been looking at potentially purchasing (one made by CAT that could be used for multiple purposes including my RC duties) run with 5v @ up to 9a negotiated (45w total). But do not do high voltage. From the wattage it should work fine, but from what the deck is showing in behavior it would limit the 5v input to 7.5w rather than use the 45w on tap.

So, to the question this all brings:

What are the specific power input profiles supported by the steam deck, from lowest to highest?

[KMO]

If a supply can provide more than 27W, the USB PD spec requires it to provide 5V, 9V and 15V.

The Steam Deck is designed to work with any USB PD-compliant 45W+ charger, and they did that by using the 15V rail, at 3A.

I don't think it has any modes other than the 2 you've seen. It's not engineered for higher current than 3A. USB-PD doesn't normally use higher than 3A below 60W. (Maybe there are some extensions I'm unaware of, but the Steam Deck doesn't support them).

You won't have any luck with a non-USB-PD-compliant charger that doesn't have the 15V supply.

You can see actual charge rate in the desktop, in the Energy Monitor tool, acccessible via the battery icon on the taskbar. Peak charge rate is something like 20-22W for the LCD version, 30-34W for the OLED version.