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The Prius can have its battery level read with a Scangauge II, but I don't see any xgauges for the Highlander Hybrid that would do it (unless the ones for the Prius happen to work with it).
It kind of sounds like the battery pack is worn out and its constantly trying to charge it. However, if it has been this way for over a year, I would think that the battery would have completely died by now, which would pretty much render the car unusable until replaced/refurbished (if its like the Prius).
Have you noticed any changes in the way it drives since you first got it? Have you noticed it not turning off at stops or rarely using EV mode? If it has a charge/assist display of some kind, does it display what you would expect, is it constantly charging?
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