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Can a T420 charger power an X1 Carbon?

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Carbon_Dater
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Can a T420 charger power an X1 Carbon?

#1 Post by Carbon_Dater » Mon Nov 12, 2018 8:54 pm

Hi Everyone,

I own an X1 Carbon (Gen. 1). It's the model from 2012-2013.

Recently, an airline lost my charger.

I am typing this message from my sister's T420.

My question is: Can I use the T420's charger with the X1 Carbon?

I know that the tips are different, but I think I can plug my X1 Carbon's tip into the T420's adapter.


The X1 Carbon uses a 90w adapter for fast charging. The T420, as I understand, uses a 65w charger.

Assuming I can connect the relevant parts, is it safe to use the 65w T420 charger with the X1 Carbon?

I know the 65w charger won't be able to do fast charging, but is it otherwise okay?

Thanks,

Carbon_Dater

Thinkpad4by3
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Re: Can a T420 charger power an X1 Carbon?

#2 Post by Thinkpad4by3 » Mon Nov 12, 2018 9:26 pm

T420 I think should have come with a 90W charger but a 65W is ok. Just get an adapter and go. There would be no problem.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

Carbon_Dater
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Location: Sydney, Australia

Re: Can a T420 charger power an X1 Carbon?

#3 Post by Carbon_Dater » Mon Nov 12, 2018 10:20 pm

Now, that's interesting. From internet research, I gather that the X1 Carbon gen. 1 is almost unique in coming with a 90w charger.

It is distinct from the T models of that era, which allegedly shipped with 65w chargers. The Carbon only had the 90w charger for fast-charging purposes, and it was dropped in later models. [At least, the big brick charger was. There may have been later slim variants.]

I'm just scared about plugging an 'underpowered' 65w adapter into the Carbon, since it's such an energy-sucking 'ultrabook' when fast charging is present.

Thinkpad4by3
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Re: Can a T420 charger power an X1 Carbon?

#4 Post by Thinkpad4by3 » Mon Nov 12, 2018 10:30 pm

The X1 is basically a T430s with a lower power CPU and my T430s would run fine on a 65W brick.

The Thinkpad has built in protection circuitry...it will tell you if it needs more power. Don't worry about it...65W is fine for the X1. You might not get fast-charging...but you are not bottle necking the machine in anyway. I power my power hungry T520 off a 65W brick once. Got hot...but no damage and that machine takes some serious juice to run.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

Carbon_Dater
Posts: 18
Joined: Mon Nov 12, 2018 8:42 pm
Location: Sydney, Australia

Re: Can a T420 charger power an X1 Carbon?

#5 Post by Carbon_Dater » Mon Nov 12, 2018 11:04 pm

Thank you for your help. That is very reassuring.

I am also thinking about the replacement charger. My 90w will arrive when they find the luggage, but I need to purchase a charger for the present.


Lenovo also offers a 45w charger here in Australia. Inexpensive and very light. Would it be safe to purchase and use later?

Part number:

0B47032

https://www.lenovo.com/au/en/accessorie ... /p/0B47032


It's either that, or this:

https://www.lenovo.com/au/en/deals/fast ... /p/0B47467

Thinkpad4by3
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Re: Can a T420 charger power an X1 Carbon?

#6 Post by Thinkpad4by3 » Mon Nov 12, 2018 11:18 pm

45W might be pushing it a bit...but its a 17W processor not 35W. Add in 5-10W for the screen and maybe an extra 5 for everything else...Thats around ~30 watts to power the machine. That leaves 15 for charging the battery.

Should be fine...would recommend a 65W though.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

Carbon_Dater
Posts: 18
Joined: Mon Nov 12, 2018 8:42 pm
Location: Sydney, Australia

Re: Can a T420 charger power an X1 Carbon?

#7 Post by Carbon_Dater » Mon Nov 12, 2018 11:42 pm

I guess we'll find out. It ordered the 45W because it was literally half the price, and it ships in 2 business days instead of 6-9.

I won't be charging the laptop when I am mobile. I only need it it suffice as mains power to operate the machine.

GrifterGuru
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Re: Can a T420 charger power an X1 Carbon?

#8 Post by GrifterGuru » Tue Nov 13, 2018 12:30 am

RE the T420 Charger..

My T420 had, when I took ownership, a 90w adapter. Great for quick charge, for when using the T420 on a dock and useful when pushing the system limits.

Also, my L412, T430, i5 X201, i5 X220 and i7 X220 all have 90w adapters

I would honestly say grab a 90w and use it, not only for ensuring a quick chargewhilst using the unit, but it will also run a bit cooler.

I tried running my T420 and T430 (as well as my other units) on the only 65w PSU I have to see which it would suit the best and honestly, it was getting far too hot for my liking when used with any of them. I have access to two other 65w PSU's and again, when tried they exhibited the same heat under normal use (web surfing, DTP, watching videos, moving groups of files from drive to drive, using light design software etc). The 90w on the other hand runs nice and cool.
X31 2672-58G, M73 10AXS, M73 10AXS i7, L412 4403-72G i5,T420 4236-9N8 i7-2630QM, T430 2349-TDG, X201 3680-C85, X220 42902
Install Mojave on X220 & T420

Carbon_Dater
Posts: 18
Joined: Mon Nov 12, 2018 8:42 pm
Location: Sydney, Australia

Re: Can a T420 charger power an X1 Carbon?

#9 Post by Carbon_Dater » Wed Nov 14, 2018 3:28 pm

I'm very interested in portability.

If the 45w charger lets me use it abroad, that's great.

I had the option to buy the slim 65w, but it was literally twice the price, and twice as long to ship. If insurance covers my 45w purchase, I might also purchase a 65w slim charger to test the difference.

I don't really need fast charging. I won't even charge the battery when abroad - I will use the 90w charger at home.

It is via this method that I hope a 45w charger will suffice when I am at the library or whatever. It won't be charging, and it won't be driven hard either.

Thinkpad4by3
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Re: Can a T420 charger power an X1 Carbon?

#10 Post by Thinkpad4by3 » Wed Nov 14, 2018 3:46 pm

Carbon_Dater wrote:
Wed Nov 14, 2018 3:28 pm
I'm very interested in portability.

If the 45w charger lets me use it abroad, that's great.

I had the option to buy the slim 65w, but it was literally twice the price, and twice as long to ship. If insurance covers my 45w purchase, I might also purchase a 65w slim charger to test the difference.

I don't really need fast charging. I won't even charge the battery when abroad - I will use the 90w charger at home.

It is via this method that I hope a 45w charger will suffice when I am at the library or whatever. It won't be charging, and it won't be driven hard either.
The computer will charge if the 45W isn't being used entirely to power the rest of the computer...and at the libray power consumption will be around 5-6W. My T520 with full brightness idling takes like 11W.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

Carbon_Dater
Posts: 18
Joined: Mon Nov 12, 2018 8:42 pm
Location: Sydney, Australia

Re: Can a T420 charger power an X1 Carbon?

#11 Post by Carbon_Dater » Wed Nov 14, 2018 4:41 pm

Right. It's important to note, and I was probably not clear enough in so doing, that I was going to (and have) received my 90w charger back from the airline.

I will be using the 90w charger most of the time, when the laptop as at home and on mains.

But I hope to use the 45w charger when it is at the library or university. It will already be charged when I get there, and the 45w is just to keep it powered on without charging.

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