CLS55 AMG 06, SL350 06, 996 cab, all current. Gone : E500 W211, 2x M5s and far,far too many 911s
My aux battery has just been changed as it started showing a red battery on the dash. When I took it out it was the original i.e 13 years old! so they last ok as they don't get used and are charged by the alternator anyway. At least that's the case on my w219 cls.