Yes I borrowed a battery charger off a friend, I think it was an Acctiva Professional, it looked expensive anyway! Read the instructions and found a mode called refresh which is used to charge the battery if it is suspected that the battery has been deeply discharged (e.g. battery sulphated). Says using this mode the plates are reactivated (degradation of sulphate layer). Took 48hrs to complete but now with a fully charged/refreshed battery and a new alternator all is working perfectly again.