The AC Adapter is for 20V output. [1] [2].
[1[ https://www.amazon.com/GHU-Adapter-Compatible-ThinkPad-Chromebook/dp/B079DNSK6W/
[2] https://www.amazon.com/Jeestam-Charger-Thinkpad-4X20E50574-ADL170NLC2A/dp/B08CVBGNFK/
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