Does the KardiaBand use my watch's battery? Updated January 05, 2018 17:00 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? Is KardiaBand water resistant? How do I change or replace the KardiaMobile battery? How tight does the KardiaBand need to be on your wrist? Will SmartRhythm affect Apple Watch battery life? If so, will I need to charge my Apple Watch daily?