AO Silver Member
Join Date: Mar 2003
Choose a Bosch (from the Batteries on Line link from 147dav's comment) or Varta battery for quality and specification (its the same battery joint owned company for Bosch and Varta).
If looking to buy from other sources be careful of recommended battery listings. More than a few retailers recommend smaller capacity batteries (Ah and cold cranking performance) to appear cheaper. Get the best Ah and cold cranking performance specification you can get. Check the physical size also.
If you still have an original Alfa (Exide possibly?) battery it is almost certainly due to be replaced. Also if its noticably slower in cranking the starter at low temperatures change it sooner rather than later.
'A business absolutely devoted to service will have only one worry about profits. They will be embarrassingly large.' - Henry Ford.