No need battery, use solar system to operate.
24-Hour Hand
Chronograph
Non Reflective Coating Glass
Eco-Drive 150 Days
Water Resistance-50
ECO DRIVE INFO
Eco-Drive is the series name of a line of mainly light powered watches manufactured by the Citizen Watch Co., Ltd. The first Eco-Drive watches were sold in 1995.
Light as power source
Most Eco-Drive watches are equipped with a special titanium lithium-ion secondary battery that is charged by an amorphous silicon solar cell located behind the dial.The titanium lithium-ion composition precludes it from being affected from the regular charge/discharge cycle of other types of rechargeable batteries. Light passes through the covering crystal and dial before it reaches the solar cell.
Depending on the electronic movement model, a fully-charged secondary power cell could run with no further charging anywhere from 30 days to 3,175 days (8.7 years), though most Eco-Drive mens watchmodels offer a 6 months power reserve.[4] If kept in the dark for too long, some movement models engage a hibernate mode, where the hands of the watch would stop running but the internal quartz movement would still keep track of time. If an ample supply of light is given, the hands would move to the proper positions and resume regular timekeeping.
Temperature difference as power source
Citizen Eco-Drive Thermo watches were introduced in 1999 and use the temperature difference between the wearer's arm and the surrounding environment as a power source. The rare Eco-Drive Thermo watches use the Seebeck effect to generate thermo electricity that powers the electronic movement and charges the secondary power cell. In the sun or in the tropics the ambient temperature can come close to or exceed the temperature of the wearer's wrist causing the watch to stop generating thermo electricity. In case no power is generated, an Eco-Drive Thermo movement will save power by moving the second hand in ten second increments until the production of thermo electricity is resumed.
Hybrid Eco-Drive movements
Citizen also built an automatic quartz powered watch, the Citizen Promaster Eco-Duo Drive (released in December 1998).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. This model was an attempt to enter higher-priced markets (at a cost of around $1,000 USD). The Eco-Duo Drive technology failed to attract consumer interest and Citizen has since stopped making use of the unique movement.
Secondary battery life expectancy
According to Citizen Europe, laboratory test showed that after 20 years the secondary battery retains a power storage capacity of 80%.[7] Citizen states that their lubricants for Long-Lasting Precision Equipment when used in watches, timepiece movements remain smooth for a long time as the oil does not harden even after 20 years.
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