Had my last casio waveceptor for eight years it never needed batteries and I never set the time in eight years. Sadly the watchband broke after many years of abuse I always consider this the best watch I own. I have fancy watches however this is my best watch. I originally purchased two one with a metal band that still works and one with a rubber band that is still operational.  I liked the new metal band so I purchased another rubber band as well.  The original two watches purchased eight years ago still work and I have never set the time or replaced a batt.