What Is a Power Reserve?
The power reserve of a watch refers to the duration it can operate without being wound or, in the case of automatic watches, without movement. This feature measures the energy stored in the mainspring, which serves as the timepiece's power source. Power reserves are typically expressed in hours, with most modern watches offering 40 to 70 hours of uninterrupted operation.
Why Does Power Reserve Matter?
A longer power reserve is especially convenient for those who rotate between multiple watches or wear their timepiece sporadically. It ensures that the watch continues to keep accurate time even if it’s left unworn for a few days. High-performance watches may offer extended reserves—some even up to 10 days—through innovations in mainspring size, barrel design, or advanced materials.
How Is Power Reserve Indicated?
Certain watches feature a power reserve indicator on the dial or movement, offering a visual representation of the remaining energy. This complication enhances usability by alerting the wearer when it’s time to wind the watch, ensuring continuous operation.
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