Smart & Connected Life Smart Watches & Wearables 38 38 people found this article helpful Directions for Replacing a Garmin Heart Rate Strap Battery The chest strap transmits heart rate information to your sports device By Fred Zahradnik Freelance Contributor Former Lifewire writer Fred Zahradnik has a long history as a writer and is considered an expert on all things related to GPS products and software. our editorial process Fred Zahradnik Updated October 28, 2019 Garmin Smart Watches & Wearables Working From Home Headphones & Ear Buds Smart Home Smart Watches & Wearables Travel Tech Connected Car Tech iPods & MP3 Players Tweet Share Email Garmin produces GPS devices, such as the Edge cycle computers for bike-specific navigation and Forerunner GPS watches for runners and triathletes. These devices and others accept input from the Garmin heart rate monitor strap. The soft strap is worn around the chest and transmits your heart rate to any compatible device. Changing the Battery on the Heart Rate Monitor Stap The heart rate straps work well, but their batteries last about three years or less if used regularly. After you remove the dead battery, wait a full 30 seconds before inserting a new battery. This gives the unit time to reset. Otherwise, it may not recognize the new battery and won't transmit a reading to your device. The replacement battery is a CR2032 Lithium Coin Cell, 3-volt battery, commonly available in grocery and drug stores. Here's how to change the battery: Locate the battery module on the back of the heart rate strap transmitter unit. Remove the four screws on the back of the module. Older models didn't use screws. On those, use a coin—a quarter works best—to turn the battery cover counterclockwise. The cover is marked with the direction and "Open" on the cover. Remove the cover and the old battery. Don't misplace the O-ring gasket. Wait a full 30 seconds to give the unit time to reset. Place the new battery in the compartment with the positive (+) side facing up. Do not damage or lose the rubber O-ring gasket. Position it correctly. Replace the back cover and the four screws or twist the cover clockwise firmly on older models without screws. Pair The Strap Again You may need to pair the heart rate monitor strap with your fitness device again after replacing the battery. See your owner's manual for pairing instructions. After it is paired, your Garmin sports device recognizes the heart rate monitor each time you put it on.