05-03-2012 12:32 PM
I have a T400 that's a few years old. I replaced the battery about 6 months ago and it's been working great until last week. Now, the laptop won't run using the battery - it must be plugged into AC. The battery shows as 100% charged; however, if I unplug the power cord ... instant death.
I'm guessing this has something to do with a component that knows how to switch between the power source internally???
I've tried to unplug, leave for a while & plug back in. I have also removed & reinserted teh battery. Nothing changes.
Anyone have any suggestions?
05-03-2012 01:56 PM - edited 05-03-2012 01:56 PM
You only have one chance to exlude the system board as the source of the problem:
Try annother (borrowed) battery!
It happens, that a dead battery shows full charge, Power Manager tells status "good" but the most battery-cells really are "dead". In most cases it happens to "OEM" (replacement) batteries after a couple of months use but also can happen sometimes with original Lenovo batteries.