Energy
🔸Automatic, battery, or solar? The weak point of watches is energy.
The ancient hand-crank has all the mechanical components that need maintenance, they can break down.
The battery-powered quartz It is only worthwhile if it has a battery life of several years; if it lasts 10 years, even better. If you have to change the battery every year, forget it.
The solar It is advantageous if the internal battery can be easily replaced at low cost. Average life span: 10 years. Some batteries or capacitors are very expensive and must be replaced by a watchmaker.
The automatic charge It is still excellent, but it is often associated
with mechanical watches. If well made, it has a very long lifespan.