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AutoZone should be able test the old battery and I think the alternator. Suggest you not remove the battery terminals when the engine is running. The result can damage the alternator or other electronics! But since you did and the engine quit might be the alternator is dead.

Pickup a low cost (under $10) volt-ohm-milliamp meter. Check the battery voltage at the terminals with engine off. Should be 12.6-12.8v for a battery with a 100% charge. Start the engine and check the voltage again (battery cables still attached). The voltage should now be around 13.5-14.5V, as the alternator should be charging the battery (at a higher then battery voltage). If the voltage is the same as when the engine is off (or low), you have an alternator problem.

The new battery may be handling the load until it too goes dead.
 
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