Amazon.com : BoxWave Charger Compatible with Nikon D3100 (Charger by BoxWave) - Digital Camera Battery Charger, Car Charger for Camera Batteries for Nikon D3100, Nikon D3100 | Coolpix P7000 : Digital Camera
Amazon.com : Battery Grip Bundle for Nikon D3100/D3200/D3300 Includes Vertical Battery Grip, 1 ENEL14A Long-Life Battery, Charger, More : Electronics
Amazon.com : BoxWave Charger Compatible with Nikon D3100 (Charger by BoxWave) - Digital Camera Battery Charger, Car Charger for Camera Batteries for Nikon D3100, Nikon D3100 | Coolpix P7000 : Digital Camera
Amazon.com : Wasabi Power Battery (2-Pack) and Charger for Nikon EN-EL14, EN-EL14a and Nikon P7000, P7100, P7700, P7800, D3100, D3200, D3300, D5100, D5200, D5300, Df : Digital Camera Batteries : Electronics
Amazon.com: Nikon D3100 Digital Camera Battery Charger (110/220v with Car & EU adapters) - Replacement Charger for Nikon MH-24 Charger : Electronics