I've had an issue with my battery, but a short was found and repaired. This weekend I received the Service Lithium-ion battery message but OnStar does not see the code. I received a text from OnStar but when I called they told me they did not have any codes being thrown. I received the message around the same time that I was using a portable air compressor to add air to my tire, plugged in to the cars outlet (cigarette lighter). Could that have caused this? Everything else is perfect with the car. No issue since. Thoughts?