I purchased my battery 9 months ago from a BMW dealer for approx. $150 and this weekend it was dead. The car is driven very little, it's a 93 with 36,000 miles and most drives are shorter than 30 miles with a long trip maybe once a year (2,000 miles round trip). My questions are, is this typical for this battery? Does anyone recommend a different battery? The dealer recommends installing a battery tender for est. $120 that I can plug in when not driving the car and it will keep the battery charged. They do not recommend any other battery (suprise!). Has anyone had this charger installed? They said it would be in the trunk or engine bay. I've fully charged my battery now and am thinking of having the dealer install this charger this week. Any comments will be appreciated. Where was yours installed, approximate how much, could I purchase one myself and install? Anyone have a source for this type of charger? I use an exide for regular charging. Thanks.