A somewhat recent firmware update gave the Tesla Model S this blue bar. This blue bar shows the range that is lost due to the coldness of the battery pack.
In the video above, KmanAuto shows us the blue bar.
You'll typically see this blue bar when the battery pack has a lower state of charge and temps are low. These scenarios increase resistance of the cells and reduce the overall power.
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Have you seen this blue bar on your Model S? Did you wonder what it meant? Well, now you know.