AO Silver Member
Join Date: Mar 2003
Just a personal comment and I understand it may be a common complaint for the 159 but 11.62 volts is more than acceptable for a battery in working condition. Holding its charge may not be the issue and the cold crankng capacity of the battery may be less than ideal. For the battery to be failing to start the car in cold conditions the voltage must be dropping to something like 9.5v or 10.5v under load as 10.8v is normally the minimum acceptable battery voltage for cold starts.
Find out your current battery's Ah rating and cold cranking/low temperature current capacity and consider the a new battery (Bosch or Varta) either larger if it will fit or with improved specifications if possible (Bosch S6 or S5).
'A business absolutely devoted to service will have only one worry about profits. They will be embarrassingly large.' - Henry Ford.