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 : EN-EL9 EN EL9a Battery Charger Pack, LP Charger Pack Compatible with Nikon D40, D40X, D60, D3000, D5000 Cameras, Replacement for Nikon EN EL9, EN-EL9a & MH-23 : Electronics