CITIZEN
ECO-Drive
Eco-Drive means "organic drive". The term
"Eco-Drive" comes from the watch maker Citizen for a
large series of solar powered quartz watches.
In an Eco-Drive Clock is a special lithium-ion
battery that constantly over a solar cell which also
serves as a dial charged. The solar cell is a light
cell from silicon, which can convert natural and
even artificial light into electricity.
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Eco-Drive watch with a fully charged battery can be
150 to 240 days run without source. This period is
called dark transitional
reserve.
Some watches have a Citizen dark
transitional reserve of up
to 8 years. This enormous period for these
Watches accomplished by mapping the function of the
hand at a dark time (ie, the clock will be exposed
to any source of light) turns off by 24 hours. The
timing will be continued at these internal clocks,
however. Once the clock again a light source is
suspended, move the pointer to the current time and
the clock keeps running. The secondary battery in
the Eco-Drive watches, according to Citizen after 20
years still have a capacity of 80 percent.
