Well for the second year in a row I let the battery go flat while the M5 was sitting in the garage during the winter. Sigh... Now it is dead and can't be charged. Does anyone know the group code for the battery? I have a Pep Boys battery in it now, but I've fogotten the number. Sears doesn't list anything for the 535i/M5 but I know they have it sitting on the shelf in their store (same as some Lexus model I think). Thanks.