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Message: <blockquote data-quote="jarance" data-source="post: 410427" data-attributes="member: 21">when the car is shutdown, use a DC clamp-on ammeter across the positive wire at the battery. You should be able to see the current being consumed. If the current is greater than 1 amp, then there is a discharge which lead to the battery being drained of its electrical charge.Alternatively, take the car to the battery shop. They have a battery tester which will discharge the battery and tell the state of the battery. A battery which is 1 years old do not means it is good. Sometime, the battery could be manufactured way before and kept on the shelf. It could be an expired battery as lead acid battery have a certain shelf life whether use or not.</blockquote>