Eco-Drive
From Wikipedia, the free encyclopedia
Eco-Drive is a type of solar powered wristwatches manufactured by the Citizen Watch Co., Ltd. The watches are equipped with a special lithium-ion battery that is charged by an amorphous silicon solar cell located behind the dial [1]. The quality of the battery precludes it from being affected from the regular charge/discharge cycle. Light passes through the cover glass and dial before it reaches the solar cell. 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 any light.
