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A 2003 Ford Focus requires an HSB063 12-volt battery with top posts and cranking amps of at least 590. Popular brands include Super Start, Motorcraft, and Optima.

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According to the 2003 Ford Focus Owner Guide ( for North America )

2.0L SPI ( Motorcraft BXT-40R )

2.0L Zetec ( BXT-96R )

2.3 PZEV ( BXT-96R )

Those were the batteries that came in the vehicles from the factory

( BCI group size 40R and 96R )

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Q: What size battery for a 2003 Ford Focus?
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