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Forerunner
®
205/305 Owner’s Manual 65
appendIx
Accuracy may be degraded by poor
sensor contact, electrical interference,
and receiver distance from transmitter.
Battery Information
WARNING: Do not use a sharp
object to remove user-replaceable
batteries. Contact your local waste
disposal department to properly
recycle the batteries.
The heart rate monitor contains a
user-replaceable CR2032 battery.
To replace the battery:
1. Locate the circular battery
cover on the back of the heart
rate monitor.
2. Use a coin to twist the cover
counter-clockwise so the
arrow on the cover points to
OPEN.
3. Remove the cover and
replace the battery with the
positive side facing up.
NOTE: Be careful not to damage or
lose the O-ring gasket on the cover.
4. Use a coin to twist the cover
clockwise so the arrow on the
cover points to CLOSE.