I have a 2006 Honda Civic Hybrid. It's on it's second hybrid battery and that one is dying too. It's still under warranty for the hybrid battery but it's not completely dead so Honda won't replace it yet. It only takes a surface charge, discharges to almost zero after a couple of days of non-use, and my mileage is down about 17%. How has everyone's experience been with Toyota and hybrid battery replacement? I'd like to buy a Prius Prime but am concerned about Toyota's responsiveness to warranty claims.