I have had 4 or 5 Optimas in the last 6 years. When I have had them replaced, the local dealer has stated that he replaces more than he sells. I disconnect them and use a trickle charger while the car sits. But they still seem to fail. I am thinking of just switching to an Interstate, that is what my dad has used in his, also trunk mounted, and has no problems. Any opinions on this? Am I the only one with this kind of luck? Started with a yellow top, they switched me to a red top. 2 batteries ago.