Replacement battery fits 8 NSK compatible models. Specifications: 800mAh, 12V, Ni-MH. Compatible with: Endo-Mate EM13M, Endo-Mate NE131, Endo-Mate NE169, Endo-Mate U421070, Endo-Mate DT, EndoMate DT and 2 more compatible models. Replaces: Endo-Mate U421-070, NSK U421-070. NSK replacement battery designed for Medical devices. Manufactured to exact OEM specifications.