Nissan Serena C26 Battery Guide: Why the 2014 Nissan Serena Uses Two EFB Batteries The 2014 Nissan Serena C26 (DAA-HFC26) is one of the most advanced MPVs in its class, featuring Nissan’s fuel-saving Start-Stop (Idling Stop) technology. Unlike conventional vehicles that use a single battery, the Serena C26 uses two batteries working together to support