When both ends of the Heart Rate Monitor are connected, the Heart Rate Monitor is active and using battery. Store the Heart Rate Monitor with at least one chest strap unsnapped.
The battery will need to be changed periodically. Use a coin to open the battery door on the electronic tab with the Peloton logo to replace the battery. The Heart Rate Monitor uses a 3V Lithium battery model number CR2032, sold at your local drug or hardware store.
The chest strap can be washed by removing the electronic tab.