144K miles is not that bad for a $7000 Insight. As Harold said, if the pack has been replaced I would find the "When" part. That would be the primary determinant.

Then I would look at the overall condition of the car and ask about the servicing history. A carfax would also help. If the dealer history is there then I would see if the servicing was done regularly and properly.
If no history is available then it becomes more of a guess and a hope that the previous owner(s) did not skip on service and updates.

Overall, it could be worth it but I would apply a good amount of due diligence first.

Cheers;

MSantos