The Nikon MH-18 is a dedicated battery charger for the Nikon EN-EL3 series batteries, used in several Nikon DSLR cameras, including models like the D100, D70, D80, and D90. It features a straightforward plug-in design with an LED light that indicates charging status—red while charging and green when complete.

When purchasing a used MH-18 charger, ensure that the power cord and LED indicator work correctly, and inspect the contacts for wear. This ensures reliable and safe charging for your EN-EL3 batteries.