SportDog Field Trainer 400s Receiver Battery - Replacement for SportDog DC-17 Dog Training Collar Battery (150mAh, 4.8V, NI-MH) Replacement SportDog Field Trainer 400s Receiver Battery Replacement for SportDog DC-17 Dog Training Collar Batteries Lifetime Warranty Capacity: 150mAh, Upstart Battery Brand On Sale for a Limited Time!