Since this item was sold by Wayfair.com, call Wayfair Customer Service at 1-844-574-6344. They should be able to provide you with an owners manual or tell you how to remove the battery.
This item is not available anymore. The biggest difference between the two is that silk is a natural fiber and satin is a weave of the fabric and not the fabric itself. (That particular item was made with 100% polyester.)