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My car is usually pretty good and has always started even after sitting for weeks. Last week I left the key in the ignition. Saturday I noticed the airbag light was on I opened the door and the courtesy lights didn't come on. The battery was DEAD so I charged it overnight at 2 amps and it seems to be OK. My question is does leaving the key in the ignition cause extra drain. I'm not going to do it again but I wonder if that was the cause.
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