Smart & Connected Life Smart Watches & Wearables 39 39 people found this article helpful Directions for Replacing a Garmin Heart Rate Strap Battery All you need is a CR2032 Lithium Coin Cell 3-volt battery 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 on October 29, 2020 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 The Garmin heart rate monitor strap is worn around the chest and transmits your heart rate to your GPS watch and other compatible devices. The batteries last about three years or less if used regularly, so you should how to install a Garmin heart rate strap replacement battery. How to Change the Battery in a Garmin Heart Rate Strap The replacement battery you need is a CR2032 Lithium Coin Cell 3-volt battery, which is 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, then remove the plastic ring around it with your fingers. Garmin Remove the four screws on the back of the module. Garmin On older models that don't have screws, use a coin to turn the battery cover counterclockwise. Remove the cover, then tap on the back of the module to make the old battery fall out. Garmin Wait a full 30 seconds to give the unit time to reset. Otherwise, it may not recognize the new battery. Place the new battery in the compartment with the positive (+) side facing up. Garmin Replace the back cover, screws, and rubber ring around the battery module. Garmin Re-Pair Your Garmin Heart Rate Strap 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 will recognize the heart rate monitor each time you put it on.