Car batteries tested: Optima AGM, Duralast (Autozone), Everstart (Walmart), Diehard AGM (Sears), SuperStart (O'Reilly), and Autocraft (Advance). Internal resistance, cranking amps, charge rate, and cold cranking amps tested.

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Foxwell BT705 Battery Tester: https://amzn.to/34lBPVF

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