Casio 3521, Operation Manual, Page: 7 / 21

●
Checking the Charge Level
A display indicator shows the watch’s current
charge level.
Charge Level 1: Good
All functions enabled.
Charge Level 2: Good
All functions enabled.
Charge Level 3: Low
[L] flashes on the display, and the functions
below become disabled.
●
Dive Mode
●
Face illumination
●
Sounds (alarm, etc.)
Charge Level 4: Low
When the battery charge drops lower than
Level 3, [CHG] starts to flash on the display
and all functions become disabled.
Charge Level 5: Dead
The digital display will go blank if the battery
goes dead. Memory data is lost, and watch
settings are returned to their initial factory
defaults.
Important!
●
Should the battery go low or go dead,
expose the face (solar panel) to light as
soon as possible.
Note
●
When [H], [M], and [L] are all flashing
on the display, it means that all
functions are disabled due to
momentary battery power
consumption.
l
[H], [M], and [L] are flashing on the
display.
●
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 4 minutes
10,000 24 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
2 hours
Medium charge n High
charge
26 hours
High charge
n
Full charge
7 hours
●
Sunny day, near a window (10,000 lux)
Dead battery
n
Medium
charge
9 hours
Medium charge n High
charge
135 hours
High charge
n
Full charge
36 hours
●
Overcast day, near a window (5,000 lux)
Dead battery
n
Medium
charge
19 hours
Medium charge n High
charge
275 hours
High charge n Full charge
73 hours
●
Indoor fluorescent lighting (500 lux)
Dead battery n Medium
charge
243 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.
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
Dive 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.
Watch Operation Guide 3521
7