Replacement battery fits 7 Petsafe compatible models. Specifications: 150mAh, 7.2V, Ni-MH. Compatible with: Field Trainer SD-400S, Field FT-100, 250m PDT20-12471, 400m PDT20-10646, PDT00-11234, SRT-100 and 1 more compatible models. Replaces: Field DC-16, SportDog 650-059, SportDog DC-16. Petsafe replacement battery designed for Dog Collar devices. Provides reliable power for your device.