Does anyone know what factors contribute to battery life in quartz watches? Nowadays, I see some watches that advertise 10 year battery life, others with 7 years, and yet others with 3 years, etc. And it's not just a matter of functions; some of the 3 year watches are simple time-and-date analogs. Is it mainly the quality of the battery? Or are some movements more power-efficient than others?
Thanks in advance for any insight.