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Eco-Drive watches were introduced on the marketplace in 1995 from the Citizen Watch company.

The twenty five years between 1972 to 1995 can be predicted period of solar watches. This span of twenty-four years has seen many historic collectible watches like the Synchronar, Nepro along with the Sicura LCD. This changed after launch of the Citizen Eco-Drive new watches in 1995. This significantly changed our perceptions about watches.

What Exactly Citizen's Eco-Drive Watches are? The Eco-Drive technologies is aimed using a titanium lithium battery, which has charged by amorphous silicon made solar cell, which can be located behind the dial of the wristwatch. This special battery type does not get influenced during charging / discharging cycles and is durable enough to get a long life cycle. The Citizen watch company claims that after 20 decades of use, the secondary battery keeps a power storage capacity of 80 percent (Source: Citizen Europe, Laboratory evaluations ). After the watch is exposed to the mild whether sunlight or any type of light, the light passes through the dial of this watch and reaches to the solar cell underneath dial, charging the battery of this wristwatch.
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Having said this, typically typical office lighting is not enough for these watches to get a fully charged battery. It's advisable and recommended to use natural outdoor light to attain the entire charge. However the office or home light conditions are good enough to keep these watches continually charged.

Usually typical eco-drive versions can function up to 30 days to 4 years with no further charge required based on the digital movement and the version of this watch. A few of the models keep the inner quartz movement running even if the watch is stored in dark for long time. Though hands of the watch stops when kept in dark for too long, however since the internal quartz movement remains running, the hands will move into the current period and resume functioning as before as soon as the watch is exposed to the light .
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The eco-drive thermal watches carries temperature difference as power source. Interesting is not it? Now how can it function? Well, these watches take the origin of electricity from the temperature difference between the arms in which it is wore and the surrounding environment. Woeehhh, but how? Well this very unique Eco-Drive thermal wrist watches utilize the proprietary technology to generate thermo electricity to control the secondary power battery or cell within the watch. The wearer's arm temperature is higher than the surrounding temperature except at sunlight or might be in the tropic regions. But what's finest, even those occasions when you're outside in sunlight or on a holiday to tropical area, this wonderful eco-drive thermal watch will save electricity via it's energy saving features until the creation and generation of thermo power is resumed.

So yes, you can use both light and thermo power to power a watch. Eco-Drive watches have been a significant success with all the inbuilt features and fashionable technology.

While talking about Citizen Watches notably Citizen Eco-Drive and Thermal Watches, citizen also introduced Citizen Eco-Duo Watches. Now what is Eco-Duo watches? Well as the title Eco-Duo informs these watches utilized both i.e. mechanical power and the solar powered cell to power the digital movement of the watch. As a result of this double energy supply, these watches can also be called as Hybrid Eco-Drive movement watches. But this models from citizen failed to entice customers due to large pricing (Were available for a grand and higher).
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Eco-Drive watches are definitely interesting and technologically advanced time-keeping equipment. But in the modern days the watches are getting to be more of jewellery rather than due to their time-keeping values. Thus I am not certain as the amount of buyers are really buying eco-drive watches for the ecological benefits of light powered watches suggesting less waste and reduced energy demands and time keeping.

Eco-Drive technology also provides fuel to the theory of disposable watches. But as mentioned previously with watches being considered as gem and a showpiece, not sure how far the progress with disposable watches can go?