Does the KardiaBand use my watch's battery? Updated August 01, 2020 03:30 No, the KardiaBand has its own battery and does not draw power from the Apple Watch it is used with. Running the Kardia watch app can affect how long your watch battery lasts, per this article. Related articles Does KardiaBand have a battery and can it be changed? How do I change or replace the KardiaMobile battery? Does the KardiaBand need to be charged? What Apple Watch Do I Have? I keep getting recordings that look noisy and with an “Unreadable” results. What does that mean and how can I prevent it?