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Didn't know this was possible!

I have a bunch of old thinkpads and need to keep around 3 different chargers (round, rectangular and usb-c). Could be great to go all in USB-C at some point.

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Lenovo chargers are 20V. USB-C PD supports that and there are "Type C to Lenovo" cables with integrated circuit to negotiate the voltage. You need to have the correct wattage of the USB-C charger though.

There are adapters available for USB C cables if you don't want to modify your computer but want to use the same charger.

https://www.aliexpress.com/item/1005005233750368.html

https://www.aliexpress.com/item/1005005703577535.html

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