However, you should look at the existing battery or your owner's manual. The battery's CCA rating will be printed on its label. That's the best indicator of the correct amperage.
Auto parts stores also have look-up tools online and in-store that can tell you the recommended CCA range for your specific vehicle based on year, make, model, and engine. Using one of these tools is strongly recommended over trying to guess. Choosing a battery with too few CCAs may lead to starting problems, especially in cold weather, while a battery with excessively high CCAs is generally fine (though might be unnecessarily expensive).
