We are here to help you For quick and easy service, contact us:   Phone:   630-761-1106 Fax:   630-761-1107 Toll Free:   888-744-6277		PC 1300 How do I exchange the battery in the chest belt? Note how the battery is inserted into the casing Remove the battery from the casing Insert the new battery in the correct position. Make sure that the ring seal has not been displaced Close the chest belt cover Operating instructions International