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87 Posts

11-17-2008

Birmingham, AL

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65W charger for T520

2011-10-31, 13:21 PM

I have a small 65 W power cord that I used to use with my old T61. Yesterday I tried using it with my 520 and when I booted a message appeared saying something about the wattage being too low.

 

Today, AFTER I have already booted up, I plugged this power cord in and it seems to be working fine.However, I am worried that charging the battery with this charger will somehow reduce the life of the battery, since thus far I have been VERY impressed with battery performance and I want to keep it that way.

 

Is there a risk of this cord harming my computer in any way?

 

It is a Lenovo charger. It reads "P/N 92P1156" and "FRU P/N: 42T5282".

 

 

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437 Posts

08-13-2010

Tucson, Arizona

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Re: 65W charger for T520

2011-10-31, 16:26 PM
65W is too little. My older than your T61, a T60, uses a 90W brick. The newer T510 also came with a 90W brick. They are interchangeable, and they came with each Thinkpad. I uave a travel adapter that also works for both the T60 and T510 - 90W. What happened to yours?
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96 Posts

07-31-2011

england, york

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Re: 65W charger for T520

2011-10-31, 16:47 PM

should be fine

 

My T400 with switchable graphics uses a 90W

 

I use a 65w all day at work and it just charges the battery slower

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87 Posts

01-25-2010

Canada

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Re: 65W charger for T520

2011-10-31, 17:58 PM

I'm in the same boat:

I'm using my old T61 charger, which stays at home, and my new 90W charger for my T420s stays with me at all times...  I haven't noticed any issues so far except that the 65W power cord charges the battery from dead to max much much slower.

 

I stole this from somewhere:

 

"When it comes to the ac adapter there are two specifications you need to focus on:

 

1. Voltage (output)

2. Amperage (output)

 

I'll use the example of an Asus notebook I have in the shop right now.  It actually shipped with a 65W ac adapter, as it only had integrated graphics.  However, there was an alternate model that shipped with a discrete adapter (nVidia 6600go).  That model required a 90W adapter.

 

On both models, the AC adapters are 19V output models.  Where they differ, however, is in the maximum output amperage.

 

The 65W max amps out is 3.42A, and the 90W is 4.74A.

 

Keep in mind that WATTAGE = VOLTS x AMPS...

 

The other thing to understand is that the ac adapter is not always putting out 65W or 90W.  The long and short of it is that the notebook (or PC) draws a certain amount of amperage per component usage (on desktops, it tends to be a bit more constant as notebooks now have active power management, which means they adjust their performance and power usage specs according to usage (though, desktops are starting to have active power management more and more also)).

 

So the bottom line is that, as long as the AC adapter is compatible with the unit, a 65W requiring notebook can use a 90W adapter, because the voltage is constant and its total amperage usage will never reach the full capability of the adapter.  However, a 90W notebook charging on a 65W adapter, and running under heavy load (nVidia) will charge much slower or not at all.  Hope this helps!"

 

 

Peednus

_______________________________________________________
T420s, i5-2520M @2.5, nVidia 4200m, 8GB DDR3, OCZ Vertex 3 Max IOPS 240GB SSD, Hitachi 320GB @7200rpm ulrabay, 8Pro x64
T61, Centrino Duo @1.8, GM965, 4GB PC2-5300 DDR2 @667MHz, OCZ Agility 120GB SSD, 7Pro x64
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9644 Posts

12-27-2009

Canada

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Re: 65W charger for T520

2011-11-01, 1:47 AM
If you have discrete graphics, you may find the battery charges slower or actually drains under high loads.

It won't damage the battery per se, nor will it wear it out (in any noticeable measure, if at all).

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
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437 Posts

08-13-2010

Tucson, Arizona

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  • Message 6 of 6

Re: 65W charger for T520

2011-11-01, 4:21 AM
If the T60 came with a 90W adapter, so should the NEWER T61. My son has one of those and it came with a 90W adapter. Somethbing is strange.
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