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I have a 2011 Outback 36,500 miles, I was away for 2 weeks and came back to a dead car battery. The window was left down. Any reason why the battery would be dead in just 2 weeks? Any chance the window had an effect on it.

Car was in garage in cold weather <30F
 

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Battery life is impacted by lots of things. Very short trips to work in very cold or hot weather dramatically impacts battery life. Window down will not impact battery unless the door was left ajar or keys in the ignition etc. Even one instance of killing the battery flat from leaving lights on etc can dramatically reduce the battery life.

Pending driving habits and cold weather your battery may actually never get fully charged up and be taking a beating from the cold weather. Which case a simple trickle charger tossed on it over night every few weeks might make it a FAR FAR happier battery. Every car has this issue pending how you use it on a daily basis and cold temps. Extreme hot temps can be just as bad by the way.
 
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