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15. General Reference for Charging Times
of Solar-Powered Watches
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
(lx)
500
1,000
60-70 cm (24-28 in.) under a
fluorescent lamp (30 W)
2 hours 20 hours
······
40 minutes 6.5 hours 150 hours
12 minutes 2.5 hours 45 hours
2 minutes 45 minutes 9 hours
20 cm (8 in.) under a
fluorescent lamp (30 W)
Outdoors, cloudy
Outdoors, summer, under
direct sunlight
3,000
10,000
100,000
Environment
Interior lighting
Charging time
4 hours 45 hours
Charging time
from stopped state
to one-second
interval movement
Charging time to
fully charged
······
Charging time for
1 day of operation
62
[Note] During two-second interval movement:
(1) The time cannot be corrected by regular automatic or free reception, and the time
cannot be corrected manually.
(2) Only the time mode is displayed, and other modes cannot be used.
C. Overcharging Prevention Function
When the secondary battery becomes fully charged by exposing the solar cell to light,
the overcharging prevention function is activated automatically to prevent the battery
from being charged further. There is no effect on the secondary battery, timekeeping
accuracy, watch functions or performance no matter how much the watch is charged.
