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check the specs on your battery
When my battery died the AAA guy said he would test mine but would not sell me theirs since they had too many problems with them due to the Boxster's (and other modern cars) high electrical demands.
A friend with a MB had problems with failure after a few days. He solved it by getting a replacement battery with the right power rating. I leave my car for days and sometimes a week or so with no issue. Good luck.
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