Power adaptor usb-c -> old thinkpad power connector

[pictux]

Hi guys,
as some of you I have together with my brand new t14s, an older Thinkpad.
Often I bring them in the same bag, and I'd like to spare a few hundred grams of the power supply at least; so I was looking for a power adaptor to convert the usb-c to the older connector.
I've seen something like this:


Have you ever tried this kind of adaptor?
Do you think there would be any problem for the ower suply or for the "granny" thinkpad?

Thanks for any tips!

[dr_st]

Lenovo itself sells an adapter like this:
https://www.lenovo.com/us/en/p/accessor ... 4x90u45346

As you see, they claim only 45W support. I don't know how it will behave if you connect it to a USB-C adapter that is capable of outputting higher wattage.

The "danger" of using a third-party one that does not correctly negotiate wattage, is that it may present to the laptop a higher wattage than the adapter actually support, risking overdraw, overheating and damage to the adapter (rarely to the laptop).

[pictux]

Hi and thanks for your reply!
Got it.
But I think that the 45w limit is on the output, not in the input!
Said that, if i use it with my x260 maybe it should be ok (45w), instead with the T460 it could work and have a few overheating problems (65w)....

[fatal_exception]

I can personally recommend this one: https://www.aliexpress.com/item/1005004894071598.html
Been using it with T470 and it's flawless. Advertised as 100W (20V @ 5A). Can't say what kind of charger the laptop recognizes, but there's no difference between this and a regular power brick.
Due to that I've switched to a 3-in-1 200W USB-C brick and been running 3 notebooks off of it.