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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.
Also, it is not likely that your battery is ever completely dead. Even when the battery is discharged it can still have upwards of 9 volts. If you put a voltmeter on a battery and you get a reading of 0 volts, then you may very well just need a new battery.The fact is though that 95% of batteries are never fully discharged when they need a jump start. A plug in charger is better, but you can just let the alternator charge if it is absolutely necessary.f the battery has not been damaged, and if the alternator and charging circuitry are working, then just driving around will indeed recharge it. If, after driving around for fifteen minutes or so, the car can't restart itself, something is defective-maybe the battery, maybe the charging system.