My car was unused for almost six months. I just disconnected the battery. When I re-connected it it fired right up. I did then go for a drive to give it some more juice.
Present - '06 E90 330i sport; Past - '04 E46 ZHP, '00 E46 328i
www.bmwcca.org member #388003 - Use me as a referral & you could win a one day ///M Driving School!!