I have XS batteries on my platinum(I believe D6500), which were first bought and put on my '96 3 years ago. I have run them down completely several times by playing stereo too long, went through a couple of bad alternators, and they seem to be doing really well thus far. I have been very pleased an hope they last for a long time to come, and if they do I will probably buy more when the time comes for some on other vehicles.