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But a battery power drain can also be the work of a bad alternator diode or even a faulty battery. Depending on the amount of current being drained, a parasitic draw will suck all the juice from your battery in a few hours or minutes. Here, you have four tests to help you find the culprit: The amperage battery drain test. The voltage drop battery drain test. The bad alternator diode test.
The alternator is supplying the entire electrical system while the engine is running. Of course, the battery's capacity helps smooth things out during periods of heavy load but wouldn't cause a misfire, at worst it would cause your lights to dim. The battery's job, primarily, is to store enough power to start the car or power accessories when the engine is not running.