About this replacement
SportDog Contain / Train Receiver — 3.7V Li-Polymer Replacement Battery (SAC00-16365)
This 3.7V, 950mAh Li-Polymer battery replaces the SAC00-16365 cell in the SportDog Contain and Train Receiver collar systems. It fits the containment fence receiver, Train Receiver, and Bird Launcher Receiver. Dimensions are 50.50 × 30.00 × 6.00mm — measure your existing cell before ordering if you are unsure.
- Contain, Train, and Bird Launcher Receiver fit: These receivers share the same battery footprint, voltage rail, and connector spec. One cell covers all three platforms without modification.
- Bench tested on actual hardware: We cycled this cell through the BMS on a Contain receiver. The protection circuit handled charge cutoff cleanly at full capacity, and discharge cutoff triggered correctly before cell damage voltage.
- First outdoor power-up after install: After fitting a new cell, place the collar on the dog and take them outside immediately. The receiver runs a cold-start initialisation after any power interruption — this takes longer than a warm restart. Keep the collar powered and outdoors for the first use cycle.
Why the Contain collar stops triggering stimulation near the boundary wire
The receiver needs a stable voltage to detect the boundary signal and execute stimulation. As the Li-Polymer cell ages, voltage sag under load drops the receiver below its operating threshold before the battery reads as empty. The collar appears on and charged but fails to respond at the fence perimeter. Replacing the cell restores the voltage headroom the signal detection circuit needs.
Collar not syncing to the SportDog app after battery replacement
A full power interruption during battery swap clears the collar's active Bluetooth and cellular session state. The app retains the old session and waits for a device that is now re-registering from scratch. Open the SportDog app, navigate to device settings, and remove the collar from your account. Re-pair it as a new device — the collar needs to complete fresh registration before the app will accept status updates.