Don't feel like changing batteries? - Then solar watches are the recommendation!
The perpetual motion machine, does it exist? Well, watches that draw their motive power from the sun are at least close to the idea of a device that never runs out of power. The sun will continue to shine for at least the next few billion years, and 50 years is probably enough to give you a reliable prognosis for the future of your solar-powered watch. Therefore, there is no need to worry about the hands of our solar-powered watches stopping because the battery would run out. As is guaranteed to happen to quartz watches with a battery one day in the foreseeable future. But: depending on the sensitivity of the solar cells on the watch - and it is usually the dial that contains photosensitive elements - it must be remembered to expose the watch to bright light from time to time. Fortunately, artificial light is sufficient for this. If it is lying in a cupboard or is only worn at night, it will obviously not be able to charge its battery as intended. It will still run in the dark as long as the battery contains stored energy. But that won't last forever.
It has already been hinted at: the photocells are almost always located on the top of a solar-powered wristwatch, on the dial. There, where light is most likely to reach. However, according to the state of the art, they are by no means recognisable as mini solar collectors on solar watches. They can be printed on in any way without their functionality being diminished. However, the electricity from the light-sensitive cells is not supplied directly to the quartz movement, but is first temporarily stored in a miniature battery in the case. This is where the quartz movement gets the energy it needs for its operation, not unlike how it would get it from a button cell. Not much is needed, so it's surprising that solar watches have not been around for much longer. The battery is also the reason why the solar watch has a dark reserve - i.e. it continues to run as described in the cupboard, under the shirt sleeve or at night, fed by the energy stored in the battery. Technical progress makes it possible to have more and more dark reserves. We are already talking about months. Only radio-controlled solar watches are even more clever.
Autarky in its purest form
Radio solar watches combine (near) independence from the energy supply with independence from a rate deviation of the movement. This means that your solar watch not only receives the sun's rays for charging the battery, but also signals from the DCF77 time signal transmitter in Mainflingen for the whole of Central Europe with its built-in miniature receiver. In other parts of the world, this is done by other long-wave transmitters. However, radio-controlled solar watches on wristbands usually correct their course only once a day or at night, which is quite sufficient. Both comfort features of a radio-controlled solar watch do not affect its design and remain outwardly unnoticeable. In this range, the Regent brand deals with various interpretations of a solar watch or radio-controlled solar watch, always with quartz drive. Only the word 'Solar' reveals the energy source of these wristwatches, which are also available in a partner look for men and women in different case diameters.