"The Civic Hybrid, which has been a reliable car overall in most years, has a big problem with its drive battery. The 2009 model was the worst - Almost one in five owners needed a replacement hybrid battery in our 12-month survey period. But more than 10 percent of owners of the 2003, 2004, and 2010 models also needed one," said Consumer Reports. On the issue, Honda claims that a software update was issued to older models to prevent premature battery failures.
Honda has switched to a new lithium-ion battery pack in the 2012-2013 Civic Hybrid. Hopefully, there will be less electrical issues.