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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.
Chargers. Recharging the battery with an external charger can cause it to overheat and boil over if the charger is defective or if you charge the battery too long. A defective charger might have an unregulated flow of electricity or it might charge the battery too quickly. Jessica Isaac/Demand Media.vercharging. An alternator that is overcharging the battery can cause boil over. The alternator in a vehicle continuously charges the battery while you drive. The optimum charging voltage for a battery is 14 volts.