One problem related to battery dead has been reported for the 2008 Toyota Highlander Hybrid. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota Highlander Hybrid based on all problems reported for the 2008 Highlander Hybrid.
Car dome light was left on and battery died. Battery was 3 years old so I replaced with new battery and car started and drove short distance. Couple of days later I attempted to start car but it would not start. Checked battery and it was good. While attempting to start car, I get messages about contacting dealer for the problem along with brake warning etc.