My T23 will only run a few minutes on battery. The battery says 10.8V
nominal on the case. When fully charged (T23 turned off) the battery
voltage is 12+ Volts (I have two batteries, this applies to both.
After a VERY few minutes I get the 'low battery' warning. The battery
voltage is around 11.75V.
Obviously the battery isn't dead. What's wrong here?
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I recommend you to try refreshing your battery by doing this step for 3 -5 times
1.Make a fully charge it take around 10 Hours.
2.Unplug your adapter and use the battery until it fully finish.Off by itself.
3.Repeat step1-2 for 3-5 times and see it again
It doesn't look to me that you're doing anything wrong there. Was there a specific installation requirement for the battery?
I recently changed my battery on my IBM/Lenovo and all that was necessary, was to let it charge fully before usage.
If you say your battery was charged for "a few days", then I assume there is something wrong with the battery. Next to your taskbar you should see a battery symbol. Double-click on it and you should see the Thinkpad Power Manager. If there is a tab called "Battery Information", see if that gives you more details. Look at the Manufacturing date!
If you really can't run the laptop without being connected to a power source, I would definitely return the battery or at least call the vendor. If your computer is running fine otherwise, there should be nothing wrong with the machine itself.
If you can take a screenshot of that battery information window adn post it here, I am happy to look at it.
PS: You're doing the right things when you try to use the laptop without an external power source - that's the whole idea, isn't it?
Do you get steady or blinking CHARGE indicator light on the laptop somewhere? If not, the WALL-Wart/External power supply or its connection is bad. This can be due to stressed wiring, bent DC socket or cold-solder joint where it mounts to the motherboard (inside case)... or bad outlet (house socket) or a blown PS
do you have a hard drive install??
laptop need a hard drive to start up. the one time start up you see before is just a accident. as far as battery not charge, that is the porblem you run into, when you get laptop from ebay (taking chance). you also need to download all of the drivers from IBM for the laptop.
If you have some electronic skills and are not afraid to open up your laptop then I might have a solution for this. It could be a known problem in T23 where one component is loosen from the mainboard and in that case it can be fixed with a soldering iron. Other possible cause is blown fuses. But to confirm this you have to remove the keyboard and do the check.