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37 Posts

12-20-2013

Singapore

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90 Watt Supplemental Power Adapter for Thinkpad T440S?

2014-03-09, 13:50 PM

Ok, the power adapter that came with my T440S has the following information (among others):

 

Model: ADLX65NDC3A

Input" 100-240 V - 1.5 A   50-60 HZ

Output: 20V = 3.25 A

 

I now understand that the '65' in the Model number stands for wattage.

 

I wanted to buy a spare set of power cord and adapter for use at home. So I emailed the above information to the authorized Lenovo Reseller here, and they said yes, they have it.

 

I went to purchase it today.

 

However, it is only now that I realized that the Wattage information for this new adapter is different from my old one. It is a 90 Wattage adapter. The information for this new adapter is as follows: 

 

Model number: ADLX90NDC3A

Input" 100-240 V - 1.5 A   50-60 HZ

Output: 20V = 4.5 A

 

 

Because of this difference, I have not used the new adapter yet.

 

Questions:

 

1) Can I use the new adapter (with higher wattage) for my T440S?

 

2) If the answer is yes, then what difference might there be (in terms of impact on battery, or any other parts of the laptop) as a result of this wattage difference in the new adapter? If there is any impact, is it positive or negative?

 

Thank you!

 

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3899 Posts

12-22-2008

Canada

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Re: 90 Watt Supplemental Power Adapter for Thinkpad T440S?

2014-03-09, 14:21 PM

Power (in Watts) equals Voltage (in Volts) time Current (in Amps.) In this case 20V x 3.25A = 65W and 20V x 4.5A = 90W.

 

1. Yes you can use the 90W adapter in place of the 65W adapter without fear of damaging your ThinkPad. 

 

2. The higher wattage simply means that the adapter is capable of providing more power. In normal operation you won't see any difference. The 90W adapter will probably be able to recharge the battery faster than the 65W adapter. (I say "probably" because it depends on the battery recharging circuitry.) In any case there should be no negative effects from this.

 

3. (You didn't ask.) One difference between the two adapters is the 90W unit is larger and heavier than the 65W unit. This can be an issue if you travel. If you're like me and have two adapters, one permanently installed at my desk and the other in a travel bag, use the 90W one at the desk and put the 65W one in your travel bag.

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3899 Posts

12-22-2008

Canada

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Re: 90 Watt Supplemental Power Adapter for Thinkpad T440S?

2014-03-09, 14:21 PM

Power (in Watts) equals Voltage (in Volts) time Current (in Amps.) In this case 20V x 3.25A = 65W and 20V x 4.5A = 90W.

 

1. Yes you can use the 90W adapter in place of the 65W adapter without fear of damaging your ThinkPad. 

 

2. The higher wattage simply means that the adapter is capable of providing more power. In normal operation you won't see any difference. The 90W adapter will probably be able to recharge the battery faster than the 65W adapter. (I say "probably" because it depends on the battery recharging circuitry.) In any case there should be no negative effects from this.

 

3. (You didn't ask.) One difference between the two adapters is the 90W unit is larger and heavier than the 65W unit. This can be an issue if you travel. If you're like me and have two adapters, one permanently installed at my desk and the other in a travel bag, use the 90W one at the desk and put the 65W one in your travel bag.


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21115 Posts

12-20-2008

Australia, Melbourne

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Re: 90 Watt Supplemental Power Adapter for Thinkpad T440S?

2014-03-09, 15:02 PM
the wattage rating is the maximum power that the power adapter can provide, but it only provides the power when it is needed. So basically, your laptop will only draw as much power as it needs, and the power adapter will ONLY provide enough power necessary that the laptop needs.

So if you plug in a 135 watts/90 watts adapter into the T440s, and it draws say 30 watts of power, then these adapters despite the maximum power rating only only provide 30 watts of power.
Regards,

Jin Li

May this year, be the year of 'DO'!

I am a volunteer, and not a paid staff of Lenovo or Microsoft
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37 Posts

12-20-2013

Singapore

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Re: 90 Watt Supplemental Power Adapter for Thinkpad T440S?

2014-03-09, 17:26 PM

Thanks. This puts my mind at ease.

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37 Posts

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Singapore

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Re: 90 Watt Supplemental Power Adapter for Thinkpad T440S?

2014-03-09, 17:27 PM
Thanks for the explanation. Much appreciated!
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37 Posts

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Singapore

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  • Message 6 of 6

Re: 90 Watt Supplemental Power Adapter for Thinkpad T440S?

2014-03-10, 10:59 AM

And I want to add that I really appreciate point 3 about the size/weight differences between 65 w and 90 w adapters. I didn't quite notice that myself. And now that I know, it makes sense to do what you suggest: use the heavier one for the desk and the smaller one for travel. Thanks!!!!

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