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Charging Time Guidelines
The table below shows guidelines for
approximate charging times.
Charging Times Required for 1 Day of
Operation
Light Level (Lux)
Approximate
Charging Time
50,000 8 minutes
10,000 30 minutes
5,000 48 minutes
500 8 hours
Times Required to Achieve Next Charge
Level
Sunny day, outdoors (50,000 lux)
Dead battery
n
Medium
charge
3 hours
Medium charge
n
High
charge
35 hours
High charge
n
Full charge
10 hours
Sunny day, near a window (10,000 lux)
Dead battery
n
Medium
charge
10 hours
Medium charge
n
High
charge
133 hours
High charge
n
Full charge
36 hours
Overcast day, near a window (5,000 lux)
Dead battery
n
Medium
charge
16 hours
Medium charge
n
High
charge
216 hours
High charge
n
Full charge
58 hours
Indoor fluorescent lighting (500 lux)
Dead battery
n
Medium
charge
210 hours
Medium charge
n
High
charge
-
High charge
n
Full charge
-
Note
Actual charging time depends on the
local charging environment.
Power Saving Function
Leaving the watch in a dark location for about
one hour between the hours of 10 p.m. and 6
a.m. will cause the display to go blank, and the
watch to enter Level 1 power saving. If the
watch is left in this condition for six or seven
days, the watch will enter Level 2 power
saving.
Power Saving Level 1 :
Digital display goes blank to save power. The
watch can connect with a phone at this level.
Power Saving Level 2 :
Digital display goes blank to save power. All
functions are disabled.
Recovering from Power Saving Operation
Use one of the operations below to exit power
saving.
Press any button.
Move the watch to a bright location.
Trigger auto light by angling the watch
towards your face.
Note
The watch will not enter power saving
in the cases below.
ー 
Alarm Mode
ー 
While in the Stopwatch Mode
ー 
While in the Timer Mode
You can enable or disable Power
Saving.
l
Configuring Power Saving
Function Settings
Note that the watch also may enter
power saving if its face is blocked from
light by your sleeve while you are
wearing it.
Viewing the Face in the Dark
The watch has a light that illuminates the face
for viewing in the dark.
To illuminate the face manually
Press (B) to turn on illumination.
Illumination will turn off automatically if an
alarm starts to sound.
Important!
Frequent use of illumination will run
down the battery.
Note
Display illumination is disabled when
any one of the conditions below exists.
ー 
Alarm sounding
ー 
Time calibration reception in
progress
To illuminate the face when Auto Light
is enabled
If Auto Light is enabled, face illumination will
turn on automatically whenever the watch is
positioned at an angle of 40 degrees or more.
40
degrees
or more
Watch Operation Guide 3501
8
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