Battery and Headlight problem

Hi
I have a 2008 C230 Benz
When I park the car at places, the headlights automatically turn on after a few minutes and eventually leads to the battery being dead. After using booster cables, the battery works. But still i have had this problem for weeks.
How can I fix it?
I have a 2008 C230 Benz
When I park the car at places, the headlights automatically turn on after a few minutes and eventually leads to the battery being dead. After using booster cables, the battery works. But still i have had this problem for weeks.
How can I fix it?
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