I just got a letter in the mail from Honda, they are extending the IMA Battery to 10 years or 150K. They are also suggesting Insight Owners have Honda run a diagnostic of the IMA module that might need updating. According to the letter it will change the charging routine and the amount it charges the battery.
Ryan - Yes, I saw a copy of the letter posted somewhere on the net after reading your message. It is for 00-04. Hopefully that means they have more faith in the batteries for the later models. Thanks, John