So the red statement is invalid, as it is always better to leave (connected) battery alone without using it, this will postpone the moment it will loose it´s charge over time and drop below the threshold value to be recharged again. Only then the next charge cycle will be stolen.

Now I understand that another intention of the question is how much of the battery charge will be stolen and then how many cycles will we loose by backing up 65W power supply with battery. We can detect it ourselves, we have to use PC in normal conditions with 65W and see how fast battery charge will drop to 95%. Then do the same with 90W and compare the times. I am using 90W power supply since several days and still have 100%, who has got his battery recently completely loaded? What is your charge level? BTW - if I remember well, the Lenovo power manager Balanced power plan does not give 100% CPU speed even if overloaded, even on external power supply.

You other people judging and testing the user 'ibm', you are very wrong. I am sitting here with exactly the same problem as him/her, and please do not give me advice how to run my T61.

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amn wrote:

You other people judging and testing the user 'ibm', you are very wrong. I am sitting here with exactly the same problem as him/her, and please do not give me advice how to run my T61.

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the obvious solution is to use your T61 with a battery as it was designed. ;)

have you read this post earlier in this thread?

Yes I did, and what does it have to do with anything?

My point is, the buyer should be made aware beforehand that if he removes the battery (it can be removed too) the CPU locks frequency at 1.2Ghz.

Caching in on 90W adapters afterwards is nothing short of greed backed up by false advertising. "Wow, now I have 2!". Did you know by the way that there are mile high piles of assorted adapters of various kinds at junk yards from U.S. to Singapore?

That solution you proposed is not a solution, if only because the Lenovo installed OpenSUSE Linux suffers from the same problem, and unfortunately for the owner and the battery there is no such thing in OpenSUSE Linux as Thinkpad Power Management, which has a set of nice features to prolong installed battery life by say charge thresholds etc. So, is this a solution then? No. It is more like an attempt to not only cache in on extra AC adapters but on batteries too. But if I am going to buy a expendable laptop plastic toy, I would buy some Korean stuff, not a Thinkpad. I thought Lenovo cared, i mean talking about business workstations and all.

Even if it is true about 65 watts not enough, then WHY SELL them with Thinkpads that cannot reach their advertised speeds? Or why there is no warning when opting for one to go with a Thinkpad? When you buy a car, do they, without your knowledge, install a 200hp engine and pair it with a awfully thin fuel cable, so you after a years use and careful suspicions at first find out that you only been using at most half of the engines power, and they explain it that that is the way the card was designed to go, but if you want all the power you originally opted for, you have to buy a thicker fuel cable. The explanation is fine, no doubts about it. But then, what is that thin cable doing in there to begin with?!

Well, this seems to be too late to reply, but I totally agree with ibm and amn's opinions.

I happened to check my cpu with Intel processor identification utility and found that my CPU runs at 1.19 GHz.

Well, I first thought that I may need to change my power options, but nothing changed.

Then, I tried the utility on my desktop and it showed the desktop cpu was running at its full speed.

So, I was googling if there is any other case like I found.

Here it is~!

ibm clearly mentioned the exactly same problem. Well, some may say why these guys don’t use battery but use 65W adapter only?

But it is my preference. Like some others, I would like to preserve my battery. As I have used several different laptops, based on my experiences, I think using battery in the laptop all the time does shorten the battery life.

Anyway, my point is that Lenovo should have mentioned about this issue in the manual, specification, or flyer.

Some may like to use the laptop longer, some may want to use it with full speed, and the other may want lighter battery or adapter. I believe that depends on who is using it. However, as there are specifications for parts such as adapters, cpus, rams, network cards, etc., when I purchased a laptop, I had an expectation that my laptop would run at  xx speed, and my battery would last for xx hours, and my laptop takes xx hours to charge. We got the information from the specifications, flyers, and manuals. If anything is different from the advertisement, it also should be noted.

If I knew it about the cpu speed issues with power sources, I must have had 90W adapter too.

It's like advertising that a SUV car runs 35 mpg without saying when it is on highway. But they do say it even if it is very small and on the corner of a flyer.

So,  at least from now on, Lenovo should put that info something like “CPU runs 74% with 65W adapter, 100% with 90W adapter, and 100% with battery”