My 1995 740iL has an Autocraft Silver Plus Battery with 775 CCA (Cold Cranking Amps at 0 degrees). The part number is 49-1 and the Group size is 49. The battery is vented. It came with the car when I bought it used this past summer. I have no idea where you get this brand, but probably should be easy to find (or similar brand) at a major car parts chain store.