Q: Flat battery

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After being parked for one hour my car wouldn't start and RAC had to replace battery. I have a feeling that I had left the ignition key in the 3rd position as when I came to start the car I noticed all the lights were on on the dashboard. I had been asleep for a while and I don't know why I would have left the key in that position. My question is - could that have been the cause of the flat battery after just one hour?

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