OVERSENSITIVTY : Just uncheck the "press to click option" in the "One finger" section of the trackpad's system preferences. The oversensitivity is killed definitively (but you will have to click instead of just touching the trackpad) HEAVY PRESSURE REQUIRED to produce active clicks It does not come from the battery. It is caused by a failure in Mac OS X 10.6.8 update ( 10.6.7 is much more finder friendly than 10.6.8). To solve this bug, just trash the trackpad's preference file (.plist) which is located in the Preferences folder of your user's Library and restart the Mac. The problem may come back one day, then, it will just suffice deleting this file again. As evidenced by the profuse internet calls for help, thousands of people have been seriously bothered by these two problems (especially the second) for many months. Why does'nt Apple address the matter and provide an answer ?