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The 2002 Chevy TrailBlazer uses a size 78 battery with a minimum of 740 cold cranking amps needed for starting. Cold cranking amps indicates the maximum amps the battery can provide to start your vehicle in freezing temperatures. Nowadays, there are two main battery types available: lead acid and AGM. Lead acid batteries are the traditional kind with wet cells requiring occasional water top-ups. On the other hand, AGM batteries are a more modern type with a sealed design and gel technology, eliminating the need for maintenance. AGM batteries typically last longer and offer superior performance compared to lead acid batteries, but they also tend to come with a higher price tag.
The 2002 Chevy Trailblazer requires a battery with group size 78 and 740 cold cranking amps (cca).