I have a Lenovo Thinkpad T61.
The battery in it seemed to be fine. Then about 3 weeks ago, it appeared to be totally dead. (I don't run on battery very often, but each day upon arriving at work, I'd turn on the laptop and let it start booting up as I was plugging in the power cord.) When I opened the battery status indicator from the status bar, it indicated that there was a problem with the battery.
I ordered a new battery. For several days, this new battery seemed to work fine. Now it doesn't work either. The indicator on the status bar shows it is charged to 99%. When I open the Power Manager and look at the Battery Information, it doesn't indicate a problem. The only thing I question is that it says "Current: 0.0 A" and "Wattage: -".
Since this second battery stopped working so abrubtly, I'm thinking the problem is not with the battery but something else. Thank you for your help!