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Sorry, but it would surprise me if the above mentioned reasons would've caused the battery to drain that fast in such a short amount of time!

In fact most modern car have a safety system that shuts of the power before the battery drains too much to start the engine, e.g. when you keep the interior light on!
I wonder why this didn't happen in this case!



I have personal experience with current Mercedes and BMW's that have had this problem. Fortunately my Cayenne has not. Yes, in many cases there is safeguard circuitry that is designed to prevent this, but it happens anyway.