POLAR CS300 User Manual

Page 38

ENG

Wrist Unit Battery
Do not open the wrist unit yourself. To ensure water resistance properties
and the use of qualiﬁ ed components, the wrist unit battery should be
replaced by an authorized Polar Service Center only. At the same time, a
full periodic check of the cycling computer will be done.
Note:
•

and Battery low are displayed when 10-15% of the cycling

computer battery capacity is left. The backlight and cycling computer

sounds are automatically deactivated when these are displayed.

• 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.

Speed Sensor Battery
Contact your authorized Polar Service Center to replace the speed sensor.

Transmitter Battery
If your transmitter stops working, it might be due to the battery running
out. To change the battery, you need a coin, sealing ring, and battery
(CR 2025).

1. Open the battery cover of the connector with a

coin by turning it counter clockwise from CLOSE

OPEN.

2. Remove the battery cover, lift the battery and

replace it with a new one.

3. Remove the sealing ring of the battery cover and

replace it with a new one.

4. Place the negative ( -) side of the battery against the bottom.
5. Place the cover with the arrow pointing to OPEN. Make sure that the

sealing ring is placed correctly in its groove.

6. Gently press the cover deep enough so that its exterior surface is on

the same level as the connector’s surface.

7. Turn the cover with the coin clockwise until the arrow points to CLOSE.

Make sure that the cover is closed properly!

Note:
• In order to ensure the maximum life span of the battery cover, open

it only when changing battery. Change the sealing ring every time you

change battery. Sealing rings / battery kits 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 disposed of properly according to local
regulations.