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That shouldn't happen. Check battery voltage and make sure it's above 3V. I don't get a battery warning, but a key warning often enough to be annoying too. Found a Japanese battery that has 3.24V, the highest by far, and still get key faults. It's ridiculous how many electronic glitches these cars have. I still have almost 3 years left on warranty, but so far I'm not too convinced it's a good idea to keep my car beyond warranty. We'll see as time goes by. Good luck.
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