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What does this mean? (Pic)

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It means your HV battery is also being heated as you charge to decrease total charging time. This will go away when your HV battery reaches optimal temperature for charging.

Thank you. I was traveling in 100 degree plus temps for about 3 hours (on a trip). I'm surprised it needed to be heated!

I wish I could change the subject to be more informative. DIdn't know what to call it when I asked....