I just bought the Legion Slim 7 Gen 7 proprietary GaN charger from Lenovo China and shipped to the US. It works flawlessly and it's so convenient. : r/LenovoLegion
20V 15A 300W AC Adapter Charger For Lenovo Legion 7 16IAX7-82TD004SGE Power Cord | eBay
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slim Lenovo Legion 7 16ACHg6 82N6000PUK AC Adapter with Power cord
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Original 20V 15A 300W Slim AC Adapter Charger For Lenovo Legion 7 Gen 6 16" Gaming Laptop Power Supply 16ACH6 - AliExpress