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[Over Charge Prevention Feature]
When the secondary battery becomes fully charged as result of light shining into the
watch dial (solar cell), the over charge prevention feature is activated automatically to
prevent the battery from being charged further. This prevents the performance of the
solar cell and secondary battery from deteriorating no matter how much the watch is
charged, and lets you expose the watch to light without worrying about overcharging.
10
5. General Reference for Charging Times
The time required for charging varies according to the model of the watch (color of the
dial, etc.). The following times are shown below to serve only as a reference.
* Charging time refers to the amount of time the watch is continuously exposed to light.
Illuminance
Environment
(lux)
500
Inside an ordinary office
60-70 cm (24-28 in) under a
1,000
fluorescent lamp (30 W)
20 cm (8 in) under a
3,000
fluorescent lamp (30 W)
10,000
Outdoors, cloudy weather
Outdoors, summer, under
100,000
direct sunlight
Full charging time: Time required for charging the watch from the stopped state to fully charged.
Charging time for 1 day of operation: Time required for charging the watch to run for 1 day at 1-second
interval movement.
Charging time
Approx. charging
Approx. charging
Approx. charging
time from the
time from the
time for 1 day of
stopped state until
stopped state until
1-second interval
operation
fully charged
movement
3 hours
25 hours
1.5 hours
12 hours
30 minutes
4.5 hours
9 minutes
2 hours
3 minutes
45 minutes
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80 hours
25 hours
11 hours
11
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