Your USB Type-C adapter should have enough power to support your laptop, otherwise it won't work properly. For example, the input of your laptop is 19.5V 4.62A 90W, then your USB Type-C adapter should not be lower than 90W. This is important, please check carefully before buying.
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Type-C to 7.9*5.5mm Power Cord for Lenovo Thinkpad T400 T410 T420 T420S Magnetic Converter 100W Fast Charging Cable