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The 2010 GMC Acadia comes equipped with a group size 48 battery that requires a 660 amp cold crank rating for reliable starting. Nowadays, two common types of batteries are AGM and lead acid. AGM is a newer technology using gel instead of lead acid, eliminating the need to add water like with traditional lead acid. AGM batteries typically offer higher cold crank amp ratings and longer lifespan than lead acid batteries. The drawback is that AGM batteries are more expensive.
The battery size for the 2010 GMC Acadia is H7-AGM, equivalent to Group Size 94R with 850 cold cranking amps.