I realize that this is an old thread and that my question may have been answered elsewhere, but I was looking for info on the keyfob for a used Altima I just recently purchased and saw that you mentioned to take the battery out of a second keyfob, if not being used, to save the battery life. I was wondering if leaving the battery out of a keyfob for such an extended period of time would delete the programmed car info on the keyfob? Any thoughts or info on this would be greatly appreciated.