Charging plates (I got a chair style one so I could see the display, most are just flag circles): https://www.amazon.com/gp/product/B00S7IBDGW/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Samsung made back cover with QI integration: https://www.amazon.com/gp/product/B00ITI24EK/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Backup battery: https://www.amazon.com/gp/product/B00KQ038AS/ref=oh_aui_detailpage_o00_s01?ie=UTF8&psc=1