Summary: This battery will substitute Nikon EN-EL3 and EN-EL3a. It will fit Nikon D70, D70s, D50, and D100 cameras. I have been using Lenmar brand battery for my video camera for years and no points to complain: Lenmar batteries are equal or better than originals and sold at the bargin price. Mine holds charge longer than Nikon's EN-EL3a. Buy and you won't be disappointed.