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Citizen also built an automatic quartz powered watch, the Citizen Promaster Eco-Duo Drive (released in December 1998). [26] Novel to this watch was the use of both mechanical power as well as a solar cell to power the electronic movement and charge the secondary power cell.
However, the only Eco-Drive system described on the Citizen Watch official website is the one depending solely on light to recharge. Features similar to the Eco-Drive have been developed by other manufacturers like Casio and Junghans. All Citizen Eco-Drive movements are made in Japan but the case or the bracelet may also be made in China.
Citizen's watches use lithium-ion batteries to store sufficient energy to power the watch for up to five years without light exposure, [3] by allowing the watch to enter a power-saving or hibernation mode during which the seconds hand stops until the watch is re-exposed to light. Not all have a power-save mode, yet will still hold a charge for ...
The movement of the watch draws its power from the rechargeable battery or capacitor. As long as the watch is regularly exposed to fairly strong light (such as sunlight), it never needs a battery replacement. Some models need only a few minutes of sunlight to provide weeks of energy (as in the Citizen Eco-Drive).
A common size for cells inside cordless tool battery packs. This size is also used in radio-controlled scale vehicle battery packs and some Soviet multimeters. 1 ⁄ 2-, 4 ⁄ 5 - and 5 ⁄ 4-sub-C sizes (differing in length) are also available. Soviet 332 type can be replaced with R10 (#4, 927, BF, U8) or 1.5 V elements from 3 V 2xLR10 packs ...
This model was an attempt to enter higher-priced markets (at a cost of around $1000 USD), but the technology failed to attract consumer interest and Citizen has since stopped making use of the unique movement. No other autoquartz powered watch from Citizen is known; all other Eco-Drive models only use solar power or thermal power. [citation needed]
At present Citizen is currently most renowned for their Eco-Drive movement, which allows the watch to be powered by light as opposed to a standard battery (a solar powered watch in other words)." The Citizen Holdings Co., Ltd. article points out that the Eco-Drive line is a commercially successful product line. Tough always subject to personal ...
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