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I went to Walmart and put my car's information (2000 Dodge Neon) into the electronic battery selector, and it told me to purchase a 26R-5N battery (which matches my current battery).

However, what do these numbers mean? From what I gather, the R indicates "reverse", meaning that the terminals are reversed. Some batteries online are listed as 26R with no 5N. Is that significant?

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26 - Battery Group size (determines the dimensions of the battery:

R - You are correct, this means the terminals are reversed.

5N - Not sure what this part means!

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