Question about IBM ThinkPad T22 2647 Notebook

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IBM T22 Battery won't charge & is not detected

My T22 will not charge the battery or even recognize that it has a battery (power mizer says battery is unknown). Have replaced the battery and the motherboard & tried 2 power supplies. The battery indicator led flashes yellow indicating a discharged battery. Any ideas?

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  • Jack236 Oct 24, 2007

    Thanks Viri.  I suspected that, but the charging circuit is on the system board which I have already swapped out.  Same symptom with the new one.  The correct voltage seems to be coming through the power jack but I'm not sure of the current.  Since this is the only original part between the power brick & the battery, could that be the problem?  I smelled some smoke about when the problem started but couldn't find anything obviously damaged.  IBM's troubleshooting guide led to the system board, but how likely is that same fault to exist in a new one?  Was sent the wrong board at first which did charge the battery but still could not detect it or it's charge state.  Will double check the charging circuit solder joints & maybe try some Stabilant 22 in the jack connections.

  • Jack236 Feb 08, 2009

    Turns out I received 2 bad batteries from the vendor. The third one worked. Apparently there is a circuit within the battery that identifies it as being a "genuine IBM" battery. If it doesn't read correctly the T22 will refuse to recognize that there is a battery installed.

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Put the new battery in and restart windows...this worked for me

Posted on Feb 07, 2009

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Take it to a very good technician who will open it up and check a dry joint in the charging system.  Sometimes if you donot attend to it quickly you may find your T22 refusing to power at all with the AC Adaptor.  Delicate soldering may solve your problem.  Power may not be getting to the charging circuit and the battery thus it is totaly discharged.

Posted on Oct 24, 2007

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I was given ThinkPad 2647 T22 and it has been in it's case for 1 year. I plugged it into the AC adaptor and the green indicator light came on that the battery was charged after 5 hours. When I pushed the...


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Getting hot underneth


Both batteries could be dead. But if you bought a new battery, it's unlikely. I don't know what green light you see, but if it's on the power adapter, it just means it's turned on--not that it is charging.
Two possibilities: Your power adapter is bad or the motherboard is bad. Because you say the computer works if plugged in, then you have ruled out the adapter.
You should be checking/cleaning the battery contacts and if all else fails, going for a new motherboard.

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pls first check your adapter may be problem with your adapter.

thank you

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Try running it without the battery. Sometimes an IBM battery can develop a short and cause this. If it still does it without the battery, I'm afraid it's the power management chip on the motherboard, and the motherboard will need to be replaced.

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Hi Yamato,

It is possible that the battery has been so depleted that it gobbles up all the power from the charger/adapter and leaves nothing for the laptop to use. Perhaps what you can do are:
1. try and charge the battery at least overnight with the laptop off;
2. use the adapter/charger only and remove the battery from the laptop.

Hope this be of help. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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Battery/Power Issue


Cant help with the "cheap bastard" part, that is for your own edifcation. Anyway, have you adjusted your laptop power/battery settings. If you have tried changing your settings to "Max Battery", and it is still doing this it is probably a hardware issue between the MB and the battery interface. Thus the second part of your message might be comming true. Sorry.

Aug 20, 2007 | IBM ThinkPad T22 2647 Notebook

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