Thanks RX400h for the prompt reply. I had always thought and was told (After many years of my own observations) that once a battery goes down, (not deep cycle), it's days are numbered. We have a couple of cars and it is always easier to leave the RX in the garage. We try to make an effort to get it out 'once in a while' but time carries on. Battery minder would be useful but when you think it will be driven shortly, probably would not put it on. Yes, batteries are costly!! I was wondering,,,, on a new battery about 1 or 2 years old, how long would it last in my car, in the garage, not driven? Is there a lot of drain on it? Thanks again.