It is a function only of the capacity of the battery to provide an unwavering impulse to the magnets on the balance wheel. An electronic balance-driven watch however can maintain a constant amplitude day and night because the power being transferred to the gear train does not fluctuate with the state of wind of a mainspring. Of course you can regulate a watch to take account of faster running overnight, and fluctuations in timekeeping with the state of wind may not be particularly apparent from day to day. However, once removed and set to one side, the mainspring winds down, the power to the gear train diminishes, the amplitude of the balance reduces and the accuracy of the movement is affected. One of the benefits of an automatic watch compared to hand-wind is that it maintains a constant state of wind, once fully wound, for as long as it is on the wrist of a reasonably active wearer.
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