Charging The Battery; How To Charge The Battery; Guide To Charging Times; About Energy - Seiko C-20 Instructions Manual

Charging the battery

■ How to charge the battery

Expose the dial to light to charge the watch.
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To ensure optimal performance of the watch, make
sure that the watch is kept sufficiently charged at all
times.
* Be careful to make sure that the watch does not get hot when it is charging. (The operating temperature range is
-10°C to +60°C.)
* When you first start using the watch or starting it after it stopped due to a lack of charge, charge the watch sufficiently
using the table on P.49 as a guide.
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About energy

■ Energy depletion forewarning function (Two-second
interval movement and Five-second interval movement)
The energy depletion forewarning function is activated when the energy stored in the watch runs low.
In such a case, the small seconds hand moves at two-second intervals.
If the watch continues to be in the state of two-second interval movement, the watch switches to five-second
interval movement, followed by a completely stopped state.
If the energy depletion forewarning function is activated, charge the watch sufficiently.
"How to charge the battery" → P.48
"Guide to charging times" → P.49
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* Neither the button nor the crown can be operated while the seconds hand moves at two-second or five-second
intervals. (This is not a malfunction.)
* While the seconds hand moves at five-second intervals, the hour and minute hands, as well as the date, stop
operating.
* While the seconds hand moves at five-second intervals, the automatic reception function and manual reception
function will not work. After the watch is charged sufficiently and the seconds hand returns to normal one-second
interval movement, conduct the manual reception of radio signals to set the watch to the correct time. ("Automatic
reception and manual reception" → P.19)
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Under the following situations, the energy of the
watch is likely to be depleted, resulting in stoppage
of the watch:
• The watch is concealed under a sleeve.
• The watch is used or stored under conditions where
it cannot be exposed to light for a long time.

■ Guide to charging times

Charge the watch using the times below as a guide.
Illuminance
Light source Condition (Example)
lx (LUX)
Fluorescent
700 General offices
light
Fluorescent
3,000 30 W 20 cm
light
Fluorescent
30 W 5 cm
light
10,000
Sunlight Cloudy day
Sunny day (Under the
100,000 Sunlight direct sunlight on a
summer day)
The figures of "Time required for charging the watch to start moving at one-second intervals" are estimations of
time required to charge the stopped watch by exposing it to light until it moves at steady one-second intervals.
Even if the watch is partially charged for a shorter period, the watch will resume one-second interval movement.
However, it may shortly return to two-second interval movement. Use the charging time in this column as a rough
guide for sufficient charging time.
* The seconds hand movement indicates the remaining amount of energy. "Checking the Charging Status" → P.16
* The required charging time slightly varies depending on the model of the watch.

■ Power save function

This watch is equipped with a power save function which can suppress energy consumption when it is left without receiving
an adequate light source for a certain length of time.
* There are two types of power save mode.
Power Save 1
The watch is exposed to a state without receiving an
Condition
adequate light source for 72 hours or longer.
The small seconds
hand stops pointing at
the 15-second
position, and the hour
and minute hands also
Situation
stop.
The watch conducts
automatic radio signal
receiving.
How to When the watch is exposed to an adequate light source
handle the for five seconds or longer, it displays the current time
situation again after the seconds hand is rapidly advanced.
Power Save 2
* While the watch is being charged, the seconds hand moves at "Five-second Intervals." During the "Five-second Interval Movement,"
neither the button nor the crown can be operated.
* If the "Power Save 2" mode is prolonged, the stored power amount drops and the internal current time information stored will be lost.
When the watch returns to its normal movement of one-second interval after sufficiently charging the battery, set the current time by
receiving a radio signal. ("Automatic reception and manual reception" → P.19)
In the state where
From the state where the watch is
the hand moves (The
stopped (Not charged)
watch is charged)
Time required for
Time required for charging the watch Time required for
fully charging the to start moving at charging the watch
watch one-second to last for 1 day
intervals
- - 4 hours
230 hours 6 hours
60 hours 1.5 hours 15 minutes
30 hours 30 minutes 3 minutes
Power Save 2
The watch is in an insufficient charging state for a long
time.
The small seconds
hand stops pointing at
the 45-second
position, and the hour
and minute hands also
stop.
The watch does not
conduct automatic
radio signal receiving.
After sufficiently charging the battery, set the watch for
the current time, if necessary.
1 hour
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