Laptop shows connected but not charging

I have a Lenovo ThinkPad laptop running Win7 that shows that the plug is in but it is not charging the battery. I tried taking out the battery and it still works. I tried  In Device Manager, Under the Batteries category, right-click all of the Microsoft ACPI Compliant Control Method Battery listings, and select Uninstall. This happened once a few days latter all of a sudden it started to work again and now its happening again.
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JohnBusiness Consultant (Owner)Commented:
Make sure the AC adapter is the correct adapter with the correct voltage and sufficient amperage (power).

Turn the computer OFF. Remove the battery. Plug in the AC and start up. Allow to fully start. GENTLY wiggle the plug in the back of the computer. Is AC power absolutely stable. Be sure of this.

Assuming battery out operation is perfect, then the battery itself has probably gone defective.

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dannyr86Author Commented:
I check all of that already too. The computer has a check the life of the battery and it shows that it is good. I also tried different AC plugs.
JohnBusiness Consultant (Owner)Commented:
The battery could have gone bad (circuit inside the battery) or the power circuit on the motherboard which charges the battery could have gone bad (needs repair by technician).

To rule out software, turn OFF, be sure battery is IN, power up in BIOS and see if the battery takes a charge after a few minutes. Or, start with a bootable DVD and see if it charges.
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easiest would be to test with another battery
as John said -internal circuitry in the battery can trick the laptop into thinking it's ok

so try locating one with the same laptop model, or order one, or have it tested in a shop
Logan JamesElectronics TechnicianCommented:
I have seen this before on some dell laptops, where is a third pin on the charger.
This is a manufactures safe guard against after market chargers.
in a way you can say its a pin that tells the charging hardware that its the correct charger.

So although its plugged in and windows thinks its getting power, it will not ever charger the battery.
best was to test this is look at the BIOS settings, and see if somewhere it tells you what charger is plugged in.
Im not sure if Lenvo do this, but i have seen it on other brands.
JohnBusiness Consultant (Owner)Commented:
@dannyr86  - Thanks and I was happy to help.
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