Vello BG-N12 Battery Grip for Nikon D3100, D3200, & D3300 BG-N12
Neewer Professional Vertical Battery Grip Replacement for Nikon D3100/D3200/ D3300/D5300 SLR Digital Camera, Works with 1 or 2 Pieces EN-EL14 Batteries
2022 Product Review: Nikon DSLR Dummy Battery Review and Test (D3300 and D5100) - YouTube