Thinkpad power jack

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MikeCL · #1 Post by **MikeCL** » Mon Apr 22, 2013 9:45 pm

A bit confused.. I assume the center pin is (+) and the barrel is (-) for testing purposes shouldn't the T400 be charging? The charger came from an HP it's output is 18V

Does the thinkpad have some type of hidden special pin?

ajkula66 · #2 Post by **ajkula66** » Mon Apr 22, 2013 9:48 pm

I'd strongly advise against using a non-ThinkPad AC adapter with a ThinkPad...

MikeCL · #3 Post by **MikeCL** » Mon Apr 22, 2013 10:11 pm

Yeah I know

turns out I was looking at the pinout wrong

it's charging right now and I'm sure a full charge with it off will be around 4 hours or so, but I'm not going to wait that long since I have to head out for work in about 2 hours.

emeraldgirl08 · #4 Post by **emeraldgirl08** » Mon Apr 22, 2013 11:40 pm

ajkula66 wrote:I'd strongly advise against using a non-ThinkPad AC adapter with a ThinkPad...

I second this ^^^

#5 Post by **rkawakami** » Tue Apr 23, 2013 3:53 am

FYI: http://www.kawakami-ca.com/images/20v_dc_plug.jpg

It's been documented that there's several different resistances being used, depending upon the wattage of the power supply:

http://forum.thinkpads.com/viewtopic.ph ... 44#p682644

MikeCL · #6 Post by **MikeCL** » Tue Apr 23, 2013 9:38 am

If you really want to know what I did in a desperate measure to charge it I found the pins I needed on the jack, as I don't have the right jack size I did enough to get the battery fully charged in which I get a little over 3 hours on the 6 cell pack, not sure if that's good or not.

So I got to test the laptop running off the battery installing windows 7 on the SSD and it still has great life left.

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