Where can I buy batteries for the Billy sensors? Tom P 08 October 2019 04:09 You can order replacement batteries for your Billy sensors in our online battery store at https://billy-care.myshopify.com/ Related articles What batteries do the Billy sensors use? What do I do if my sensor is offline? How do I remove sensors? How do I add or edit family members? Does everybody have the same settings/tasks or is Billy customised for me?