I have the Motorola extended battery and the cover is not flush like the stock battery. It's about 1-1.5mm higher but you don't really notice it. It still works in the Car Dock and the Multimedia Dock with room to spare. Some people seem to use the stock cover without issue but it's a tight fit and may distort the screen with the excess pressure. That's why they provide the newer cover with longer tines on it so that it provides proper space for the thicker battery.
When I installed the extended battery, the battery meter did not get wonky and correctly reported the charge level. Never had to clear the stats at all. In fact, I swap between the two batteries to keep them used and charged and the battery meter never seems to care which one is in and appears to correctly display the remaining charge for both.
That's my experience so far since receiving the extended battery a week or so before Christmas.
Kevin
When I installed the extended battery, the battery meter did not get wonky and correctly reported the charge level. Never had to clear the stats at all. In fact, I swap between the two batteries to keep them used and charged and the battery meter never seems to care which one is in and appears to correctly display the remaining charge for both.
That's my experience so far since receiving the extended battery a week or so before Christmas.
Kevin