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Depending on how your 2011 Dodge Avenger is set up and your own preferences, you may need a battery in group size 26, 86, or 75DT. The higher trim levels like SXT Plus and R/T usually require a more expensive battery due to their larger engine, but this rule doesn't always apply, so be sure to confirm your trim level. For cold weather starting, it's recommended to have at least 550 cranking amps for most uses. If you live in a very cold area, consider getting a battery with 700 amps or more. While these batteries range from approximately $100 to $300, the peace of mind they provide is invaluable in the long term.
The battery group size for the 2011 Dodge Avenger is 86.