Get a load check done on the battery. In the 8 1/2 years we owned our 96 Mystique, we replaced the battery twice (once under warranty). Extreme weather swings (the car saw +40 to -40 degrees C) combined with short trips to work every day really plays havoc with batteries. And we had to go to Ford for a replacement, no aftermarket batteries available in Canada that would fit when we needed to replace them, both times in the winter. Good luck.

1996 Mystique GS, pacific green, stock. V6, ABS, traction control, alloys and steel rims, car seats for two, now SOLD. 2004 Toyota Sienna and 2002 Nissan Pathfinder (the new work truck).