[jams]

I don't remember the exact terms but some batteries are good for normal everyday use....meaning they don't discharge very much and others work better for deep discharging. SO if you have some type of voltage draw that routinely discharges the battery ....like a powerful stereo system, trouble starting the car or a misc. draw the battery will have a limited life span.

I just heard about it on one of those Horspower TV shows. Sorry I can't remember more details. Check your alternator output VS. your voltage use.