They use plenty of batteries. Even though the volume of batteries varies depending on the dimensions of one's custom made shade, my 27-by-73-inch shade desired a comically high selection—8 D batteries, for an additional $seventeen. Lutron notes in its FAQ that battery longevity is variable, according to use, but that https://www.google.com/maps/place/Design+Blind+%26+Drapery+Service,+Inc/@26.8754702,-80.1624659,12z/data=!4m6!3m5!1s0x82ece2cad4181d7:0x79e8e1f7645305b1!8m2!3d26.875694!4d-80.1631585!16s%2Fg%2F11vspmzlmh?hl=en-US&entry=ttu&g_ep=EgoyMDI1MDMxMS4wIKXMDSoJLDEwMjExNDU1SAFQAw%3D%3D