I often have a similar problem, but I'm not sure, if this is the one mentioned in the link.
If one battery is empty, and I change to a fully loaded new one, after the first switch on of the camera, it shows an empty battery. If I switch the camera off an on again, the battery capacity is show correct most times. Sometimes I have to repeat that a few times.
But since I only have one Leica and three third party batteries, I am not sure, if the problem is in the camera or in the batteries. Two of my third party-batteries do not work at all in the M9, so I tend to think, that they are the problem.