Originally Posted by Greg H
There are Phantom energy draws in cars nowadays the memory and clock in the radio, probably some memory in the onboard computers, the easiest thing to do is just disconnect the battery.
I also disconnect the battery in my Cadillac Alante that I usually only drive in the summer. The only problem is that it takes awhile for the computer to re-program itself. During that time the fuel economy is horrible and the car doesn't perform well.
I don't know exactly how long this takes, but I would say a couple of days and around 100 miles.
I've decided to go the 'battery tender' route. Last winter I used the car a couple of times and forgot to disconnect the battery after the last use. It sat for a couple of months in that state and drained the battery so completely that it wouldn't re-charge.
Don't ask what I paid for a new battery. I'll just say that using a battery tender might not make me a rich man one day, but it will most certainly help keep me out of the poor house!