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Adapter to use barrel charger on T480s

T430-T490, T530-T590 Series
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simes
Posts: 12
Joined: Sat Feb 16, 2013 1:49 pm
Location: Cheshire, UK

Adapter to use barrel charger on T480s

#1 Post by simes » Sun Sep 25, 2022 2:14 pm

Hi, I have just ordered a secondhand T480s which will come without a charger. It needs a USB-C charger. I know I could buy a new Lenovo charger but I have several old Lenovo barrel-plug type chargers including a 65W one which is correct for T480s. In principle all I need, I think, is an adapter with a socket on one end for the barrel plug, and a USB-C plug on the other end. I've not been able to find a cable or dongle that does this. Can someone point me in the right direction, preferably to a UK supplier? Thank you.
Present: W530, X230 (two), X301, X61s
Past: 560Z, T42, T400, T60, X60s (two), X61 Tablet, X200s, T430

dr_st
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Re: Adapter to use barrel charger on T480s

#2 Post by dr_st » Sun Sep 25, 2022 2:58 pm

It is surprisingly difficult to find such a thing. Probably because USB-C chargers are "smart" and negotiate with a laptop. Such an adapter would have to know what "stupid" power supply it is connected to, present the capabilities to the laptop accordingly and perform the handshake.

The other direction is somewhat simpler, as the adapter merely requests a 20V power from the USB-C charger, and, if it is given, passes to the laptop whatever amperage the charger can provide, but they don't accurately represent the capabilities to the laptop, which causes its own problems. This is explained here:
https://www.reddit.com/r/thinkpad/comme ... c_to_slim/
Thinkpad 25 (20K7), T490 (20N3), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad

simes
Posts: 12
Joined: Sat Feb 16, 2013 1:49 pm
Location: Cheshire, UK

Re: Adapter to use barrel charger on T480s

#3 Post by simes » Mon Sep 26, 2022 5:04 am

Thank you. This is more complicated than I realised, so I have ordered a secondhand Lenovo USB-C charger to go with my secondhand T480s.
Present: W530, X230 (two), X301, X61s
Past: 560Z, T42, T400, T60, X60s (two), X61 Tablet, X200s, T430

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