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The 2003 Chevy Tahoe requires a group 34/78 battery with a minimum of 740 cold cranking amps to start easily at freezing temperatures. Two common battery types are AGM and lead acid. AGM batteries, a newer technology, use gel and mats instead of lead acid plates, making them maintenance-free and longer-lasting than standard lead acid batteries.
The ideal battery size for your 2003 Chevy Tahoe is a group size 78 740 CCA.