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A dead cell in the battery, any light on the vehicle that is pulling power from the battery, or a stuck relay. Check all the lights on the vehicle including the brake lights to make sure they are not on after you shut the vehicle down. To see if you have a dead cell in the battery, disconnect the negative battery cable overnight. If the battery is dead the next morning then the battery has a dead cell and must be replaced. If not then start looking for a light that is on or a relay that is stuck closed. Can be a power window, power seat, power door lock, or fuel pump relay.

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11y ago
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Q: What will drain the battery on a 260 e Mercedes Benz overnight?
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