@matram No confusion here on power states. I'm definitely powering off. I've tried turning off pretty much everything in the BIOS with no luck. If I take the battery out, it loses almost no charge, so it's not a self discharge problem either. I may end up contacting Lenovo about it.
@ggruen: My battery was inside the T500 and this was into the docking station with this unplugged and un-powered the whole period during vacation. I now remove battery from the notebook and will wait about 10 days to see how much charge disappeared.
Most likely it makes a difference whether the battery is inside the notebook inside the docking station (even unpowered) or totally off tthe unit ...... I guess.