What battery do I need for my Viiiiva Heart Rate Monitor? January 09, 2020 18:40 Updated The Viiiiva Heart Rate Monitor requires a standard CR2032 Lithium-ion coin cell battery. Related articles Why can't I pair my Viiiiva? It does not show up in the app scan list. Viiiiva User Manual Does Viiiiva work with HRV applications? Is Viiiiva waterproof? How do I know which Viiiiva is mine when I'm in a group?