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1. Using a coin that sits tight
into the back cover groove,
open the battery cover by
pressing slightly and turning
counter clockwise.
2. Remove the battery cover.
The battery is attached to
the cover, which should be
lifted carefully. Remove the
battery and replace with a
new one. Be careful not to
damage the threads of the
back cover.
3. Place the positive (+) side
against the cover and
negative (-) side of the
battery against the cycling
computer.
4. The sealing ring of the
battery cover is also
attached to the cover. Only
replace the sealing ring if it
is damaged. Before closing
the battery cover, make sure
that the cover’s sealing ring
is undamaged and it is
placed correctly in its
groove.
5. Put the battery cover in its
place and turn the cover
clockwise with a coin to
CLOSE position. Make sure
that the cover is closed
properly!
Excessive use of the backlight drains the cycling computer’s battery more rapidly. In cold conditions,
the low battery indicator may appear, and disappear again when you return to a warmer environment.
To ensure the maximum lifespan of the battery cover, open it only when changing battery. When
changing the battery, make sure the sealing ring is not damaged, in which case you should replace it
with a new one. Battery kits with sealing rings are available at well-equipped Polar retailers and
authorized Polar Service Centers. In the USA and Canada, sealing rings are available at authorized
Polar Service Centers only.
Keep batteries away from children. If swallowed, contact a doctor immediately. Batteries should be
properly disposed of according to local regulations.
Speed and Cadence Sensors Battery
Contact your authorized Polar Service Center for replacement speed and cadence sensors. The Service
will test the sensor after replacing the battery.
Precautions
Interference During Exercise
Electromagnetic Interference and Exercise Equipment
Disturbance may occur near high-voltage power lines, traffic lights, overhead lines of electric railways,
electric bus lines or trams, televisions, car motors, bike computers, some motor-driven exercise
equipment, cellular phones, or at electric security gates. To avoid erratic readings, move away from
possible sources of disturbance.
Polar CS400 User Manual 41