I'm planning on tucking the 6 up for a couple of months so that I can bring the 330Ci out to play for a while.

Usually when I garage a car for a period like this I just use a simple battery isolator switch to "disconnect"the battery and there have been no problems with the cars or the batteries using this approach.

The electronics and battery management technology, etc. on the 6, and other newer cars, mean that this may not be as appropriate a way to deal with this one. Just getting at the battery terminals to add an isolator terminal isn't so easy anymore and I suspect that the added complexity of this car means it might be more inclined to throw a hissy fit at this approach to saving the battery charge.

So, I'm looking at battery conditioner/charge maintenance options. The most obvious products are some of the CTEK ones, and the CTEK MXS 5.0 seems like an appropriate product.

Any feedback from others who use conditioners, or suggestions on other products?

Thanks in advance.