I recently bought a 2000 Insight used, I couldn't get a new one without paying many dollars over list. It has 70k miles and I worry about the IMA batteries. It seems they discharge sooner than I would expect but since I haven't owned the car since new I have no baseline. I now realize how expensive the batteries are to replace. I'm wondering if anyone out there has any perspective for me. I can charge the batteries almost to the top bar on the indicator but if I get a long hill they can totally discharge in less than 5miles. Are there any aftermarket batteries available?