Power Supply; Battery Indicator - Casio 2891 Operation Manual

Power Supply

The power supply of this watch uses a solar cell to generate
electrical power, which is stored by a rechargeable battery. Using
or storing the watch where it is not exposed to light regularly or
allowing it to be blocked from light by your sleeve as you are
wearing it can cause the power of the rechargeable battery to run
down. To ensure stable operation, be sure to allow the watch to be
exposed to light as much as possible when you are wearing or
storing it.
Note that all data in memory and all settings are cleared
whenever you allow the level of the rechargeable battery
to drop to Level 5.
Recover Indicator
If you use the light or alarms a number of times during a short
period, the RECOV indicator may appear on the display to indicate
that the following operations are disabled in order to allow battery
power to recover.
• Illumination
• Alarm and hourly time signal
• Timer Mode progress alert and
time up alarm
• Sensor readings
Normal operation will return after the
battery recovers.
Recover Indicator
Charging Guide Required Daily Charging Time
• The following is the daily amount
Starting from a full charge, the watch
of charging required each day to
should be able to continue operating support the operations under
for about five months without further "Example Daily Use".
charging under the example
Exposure Level
Approximate
conditions described below.
(Brightness)
Exposure Time
Outdoor Sunlight
Example Daily Use
5 minutes
(50,000 lux)
• Illumination: 1.5 seconds/day
• Alarms: 10 seconds/day
Sunlight Through a
• Direction Reading: 10 times/week
24 minutes
Window (10,000 lux)
• Altitude Readings: 10 hours/month
• Signal Reception: 6 minutes/day Overcast Daylight
Through a Window 48 minutes
• Digital Display: 18 hours/day
(5,000 lux)
Making sure the watch is exposed to
Indoor Fluorescent
8 hours
Lighting (500 lux)
light regularly ensure stable
operation.
• Charge Times Required to Advance to a Higher Level
Approximate Exposure Time
Exposure Level
(Brightness)
\ \ \ \
Level 5 Level 4 Level 3 Level 2
Outdoor Sunlight
2 hours
13 hours
(50,000 lux)
Sunlight Through a
4 hours 63 hours 29 hours
Window (10,000 lux)
Overcast Daylight
Through a Window
8 hours 128 hours 58 hours
(5,000 lux)
Indoor Fluorescent
80 hours – – –
Lighting (500 lux)
• Note that the above charging times are for reference only. Actual
charging time depends on a variety of environmental factors.
Operation Guide 2891

Battery Indicator

Level
All functions enabled.
1
Level
All functions enabled.
2
Illumination, alarms and other
tones, sensor readings, and
Level
time calibration signal
3
reception disabled.
Digital display, illumination,
Level alarms and other tones, sensor
4 readings, and time calibration
signal reception disabled.
All functions, including
Level
timekeeping, disabled.
5
• Exposing the watch to direct sunlight or other strong light may
cause the battery level indicator to indicate a level that is
momentarily higher than the actual battery level. Because of this,
you should wait for a short while after charging to check the
battery level indicator.
• Even if the battery level drops all the way to Level 5, you still will
be able to recharge the battery and use the watch again.
• If you start charging from Level 5, the display of the watch will
flash when the battery reaches Level 4. Note, however, that the
watch's functions will still remain disabled at this time, and you
should continue to expose the watch to light so the battery can
charge up the Level 2 or Level 1.
Power Loss Drop during Sensor
Readings
Regardless of whether the current battery level is Level 2 or
higher, the watch may determine that the current power level is not
enough to driver the sensor in the Compass, Pressure, or Altitude
Mode. If this happens, the display will appear as described below.
After Entering the Mode During Readings
Compass Blank
Pressure Blank
Altitude Blank
• Normal operation should return after battery power recovers.
Level 1
6 hours
– – –
Start charging at Level 4!
Battery Level 4 indicates that remaining battery power is very low.
Be sure to expose the watch to light for recharging as soon as
possible after the Level 4 indicator starts to flash. Frequent display
of the recover indicator also means that the battery is low. Expose
the watch to light to charge the battery.
Charging Precautions
Avoid charging the watch in the following locations, and anywhere
else where the watch may become very hot.
• On the dashboard of an automobile parked in the sun
• Very close to an incandescent light source or other sources of heat
• In a location exposed to direct sunlight for long periods
Note that the display panel may become black under very high
temperatures. This is temporary, and the display will appear
normal again at lower temperatures.
Depending on the light source you are using, the
case of the watch may become quite hot during
charging. Take care to guard against burn injury after
charging.
– – –
– – –
– – –
❚ To charge the battery
Point the solar panel (face) of the watch at a light source.
• Remember that even a partial blockage of the solar cell reduces
charging efficiency.
Example: Positioning the watch
Solar Cell
• The illustration shows the resin band model.
3