SUUNTO X3HR - Manual (Page 10)

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1.5. BATTERY REPLACEMENT OF THE TRANSMITTER BELT
The transmitter belt operates on a 3-Volt lithium cell, type: CR 2032.
The transmitter belt’s average expected battery life is 300 hours of use in ideal oper-
ating temperatures.When the Suunto X3HR is not receiving a signal but the transmit-
ter belt is active, a change of battery might be necessary. Refer to section 2.4.2 for
other factors that can interfere with a correct signal.
To change the battery
1. Insert a coin into the slot located on the battery compartment cover on the backside
of the transmitter belt.
2. Turn the coin counterclockwise until it is aligned with the open position marker, or
even slightly further for easy opening.
3. Remove the battery compartment cover. Ensure that the O ring and all surfaces are
clean and dry. Do not stretch the O ring.
4. Remove the old battery carefully.
5. Place the new battery into the battery compartment with the positive side facing up.
6. With the O ring in the correct position, replace the battery compartment cover and
turn it with the coin clockwise until it is aligned with the close position marker.
NOTE: You should change the battery cover and the O ring simultaneously with the
battery to ensure that the transmitter remains clean and water resistant. Replacement
covers are available from Suunto as accessories.