NEEWER Vertical Battery Grip for NIKON Work with EN-EL14 - NEEWER – neewer.com
Nikon D3100 Battery
Batmax En-el14 En-el14a Battery+led Usb Dual Charger Withtype C Port For Nikon D3100 D3200 D3300 D3400 D3500 D5600 D5100 D5200 - Digital Batteries - AliExpress
Best Buy: Nikon Rechargeable Lithium-Ion Battery for Nikon D3100 Digital Cameras 27017
1500mAh 4x EN EL14A EN EL14 ENEL14 Battery+LCD USB Dual Charger for Nikon D3100 D3200 D3300 D3400 D3500 D5600 D5100 D5200 P7000|en-el14 battery|bateria en-el14bateria en-el14a - AliExpress
Amazon.com : Neewer Professional Vertical Battery Grip Replacement for Nikon D3100/D3200/D3300/D5300 SLR Digital Camera, Works with 1 or 2 Pieces EN-EL14 Batteries : Electronics