In a message dated 12/7/99 1:32:59 PM Eastern Standard Time, RappaRivaRat@xxxx writes: << This will be my fourth battery since new, and only 9800 miles! It has been my experience that a frequently used battery will last much longer than a seldom used one, particularly if the seldom used battery is allowed to become completely or nearly discharged between uses. >> Ed, I'm on my third battery since '84. After those replacements, I think I've found the answer, which I also use on my motorcycle. The winters are long (four months) where I live (Upper Michigan) which means the summer toys hibernate during that time. For both vehicles, I adhere to a charging schedule of one day on the charger every month. I have a 10 amp auto charger for the Delorean and a 1.5 amp charger for the bike. The batteries seem to be performing well under this regime. Burke