About this replacement
Dogtra E-Fence 3500 Receiver / YS-300 Bark Collar — 3.7V Li-Polymer Replacement Battery
This 3.7V 200mAh lithium-polymer battery replaces the internal cell in the Dogtra E-Fence 3500 Receiver and YS-300 Bark Collar. The E-Fence 3500 Receiver is a wireless dog containment collar unit that detects boundary signals and triggers correction or warning responses. Capacity figure is 200mAh (0.74Wh) — match this exactly before ordering.
- E-Fence 3500 and YS-300 shared cell: Both the E-Fence 3500 Receiver and YS-300 Bark Collar use the same compact Li-Polymer cell format — same voltage rail at 3.7V, same physical envelope at 23.45 × 15.40 × 7.80mm, and the same connector orientation required for the internal board.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on representative Dogtra collar hardware. The protection circuit handled overcharge cutoff correctly and maintained stable voltage output across the collar's signal-detection and correction-delivery cycles.
- Collar reactivation after battery swap: After fitting a new cell, hold the power button until the indicator LED confirms the unit has re-paired with the transmitter base — a fresh battery resets the collar's wake state and it will not respond to boundary signals until that handshake completes.
Why the E-Fence 3500 Receiver stops responding to boundary crossings before the battery reads empty
The E-Fence 3500 Receiver's onboard protection circuit cuts power to the signal-detection module before the cell is fully depleted — this protects the Li-Polymer cell from deep discharge damage. At approximately 3.0V the receiver goes silent even though the LED may still flicker. A degraded original battery hits this cutoff voltage much sooner under the load of active boundary monitoring. Replacing the cell restores the full working voltage window above that 3.0V floor.
Collar charges but drops to zero immediately on first use after battery replacement
This usually means the new cell was received in a deeply discharged state — below around 2.5V — and the collar's charger circuit did not complete a proper pre-charge conditioning cycle. Remove the battery, apply a brief trickle charge externally at a low current (around 10–20mA) until the cell reaches 3.0V, then reinstall and charge normally through the collar's dock. Once the cell is back above 3.0V the standard charge circuit will engage and bring it up to a full 4.2V.