Lenovo laptops that DO NOT have PD3.1 use Lenovo's own proprietary power delivery solution over USB-C. For 140W they require 20V @ 7A, but PD3.1 uses 5A increments, which would be 28V. The laptops are unable to accept 28V, so they will refuse to charge at 140W when using a 3rd party charger, but will instead charge at 100W. You will slowly lose battery power if you are gaming or doing other intensive tasks while plugged into one of these chargers.

I want to correct this article and say that the Anker 717 nor the 747 will charge a Lenovo without PD3.1 beyond 100W. I already tried.

I have a Lenovo Slim Pro 9i, which uses 140 peak watts, and the only compatible USB-C charger I can find is the Lenovo Legion C140.

If a charger does not advertise a 20V @ 7A charge rate then it will not supply the 140W that Lenovo is looking for.

I've had this charger since July 2023 to power a Legion Slim 7i Gen 8. It seems like Lenovo uses a proprietary standard as my laptop refuses to charge with other 140w usb-c chargers. I'm happy with it though as it is very handy for travelling compared to the 230w brick that came with the laptop.

Pro tip: this works on planes while the 230w charger causes the power socket to switch off due to its high power draw. 

Bought it from AliExpress for around $70 including delivery to the UK at the time.

Nice for miniPC that accept USB-C power input.