Amazon.com: UltraPro Nikon D3100 Digital Camera Battery Charger (110/220v with Car & EU adapters) - UltraPro Replacement Charger for Nikon MH-24 Charger : Electronics
Amazon.com : Nikon Mh-24 Quick Charger For En-El14 Li-Ion Battery Compatible With D3100 Dslr, D5100 Dslr, And P7000 Digital Cameras : Electronics