Q: Battery dies, something drains power when the car is off

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I drive a 2010 Ford Edge and I think there is something drawing power from the battery when the vehicle is off. I have replaced the battery twice so far in 57,000 miles and the alternator is fine. It struggles to start up when I let it sit for a few hours and if it is sitting for 16 hours or more I know that I will have to jump it. Where do I start as far as figuring out what part is drawing power?

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