Eco-Drive

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Eco-Drive is a type of solar powered wrist watches manufactured by the Citizen Watch Co., Ltd. The watches are equipped with a special lithium ion battery that is continuously charged by any light source. The quality of the battery precludes it from being affected from the regular charge/discharge cycle. The watch dial is a solar panel collecting light. Depending on the model a fully charged cell will run with no further charging for 180 days to 4 years. If kept in the dark for too long, they will resume running with exposure to light.