How often does one need to change car batteries?

It really depends more on the battery than the size of the car. Most batteries will definitely let you know if you need to change them but if yours is two years old you might clean it up and look at the original label it should indicate how long you might expect it to last by warranty information or term like "three year battery." If it is giving you any trouble starting or has had to be jumped or recharged more than once recently I would change it. ... more