Forerunner ® 205/305 Owner’s Manual 5appendIxAccuracy may be degraded by poorsensor contact, electrical interference,and receiver distance from transmitter.Battery informationWArNiNg: Do not use a sharpobject to remove user-replaceablebatteres. Contact your local wastedsposal department to properlyrecycle the batteres.The heart rate monitor contains auser-replaceable CR2032 battery.To replace the battery:1. Locate the circular batterycover on the back of the heartrate monitor.2. Use a coin to twist the covercounter-clockwise so thearrow on the cover points toOPEN.3. Remove the cover andreplace the battery with thepositive side facing up.Note: Be careful not to damage orlose the O-rng gasket on the cover.4. Use a coin to twist the coverclockwise so the arrow on thecover points to CLOSE.
