2x Pack - SportDog Field Trainer SD-400S Receiver Battery - Replacement for SportDog DC-17 Dog Training Collar Battery (150mAh, 4.8V, NI-MH) Replacement SportDog Field Trainer SD-400S Receiver Battery Replacement for SportDog DC-17 Dog Training Collar Batteries Quantity: 2, Lifetime Warranty Capacity: 150mAh, Upstart Battery Brand On Sale for a Limited Time!