When buying a 2003, 2004, 2005 Honda Civic Hybrid it is important to know the condition of Integrated Motor Assist (IMA) battery. It is the main battery pack located behind the rear seat. A Honda service center at a dealership or an independent mechanic trained in hybrid cars can run a test to determine how well it is holding the charge. Honda warranties these batteries for 8 years or 80,000 miles whichever comes first. You often see a good used Civic Hybrid with 100,000 miles or more and the battery works fine, but it pays to ask questions and have it checked out.