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More than likely this is caused by a condition called "parasitic draw" on the battery. Meaning that even though the key is turned off, and removed from the ignition, something is still siphoning power from the battery. Any number of things can be the culprit. You will need to have a qualified service center do some troubleshooting to determine the source.

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Q: Why does the battery run down if not used for two days on Ford Taurus?
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