What battery do I need for my Viiiiva Heart Rate Monitor? January 26, 2022 22:24 Updated The Viiiiva Heart Rate Monitor requires a standard CR2032 Lithium-ion coin cell battery. Related articles Viiiiva User Manual Troubleshoot firmware updates I Can't Login In To The 4iiii App Configure Viiiiiva ANT+ Passthrough (iOS) Changing Your PRECISION Battery