Garmin Delta SE Dog Collar Replacement Battery 3.7V 450mAh

Garmin Delta SE Dog Training Collar Receiver — 3.7V Li-Polymer Replacement Battery (361-00069-01)

This 3.7V 450mAh Li-Polymer battery fits the Garmin Delta SE receiver unit — the collar-mounted component that receives remote correction and vibration signals during training sessions. It also fits the Delta XC Receiver and related models sharing OEM part 361-00069-01. Dimensions are 35.00 x 25.00 x 5.00mm.

• Delta SE and Delta XC receiver compatibility: These receiver units share the same battery footprint, connector pin-out, and BMS handshake protocol. Swapping this cell into either model produces no charge-rejection errors from the Garmin charging cradle.
• Bench tested on actual hardware: We cycled this cell through the Garmin charging cradle and confirmed the BMS accepted full charge termination cleanly with no over-voltage flags or premature cutoff on the protection circuit.
• First-use power-on sequence for the Delta SE receiver: After installing a fresh cell, hold the receiver's power button until the LED flashes — do not attempt to pair the handset immediately. Let the receiver complete its internal BMS initialisation cycle first, then proceed with pairing via the handheld transmitter.

Why the Delta SE receiver drains faster during outdoor training in low-signal areas

The Delta SE receiver stays in active radio-listen mode whenever the transmitter is powered on nearby. In areas with RF interference or when the trainer operates near the maximum range, the receiver's radio circuitry draws more current to maintain signal lock. This elevated draw is normal but accelerates cell depletion compared to casual short-range sessions. Keeping transmitter-to-collar distance short during training sessions reduces the receiver's radio load and extends time between charges.

Receiver LED flashes but won't hold a charge after battery replacement

This usually means the new cell voltage arrived below the BMS re-activation threshold — common with Li-Polymer cells that have sat in storage. The Garmin cradle expects to see at least 3.0V at the battery terminals before it initiates a standard charge cycle. If the cradle LED shows no activity after seating the receiver, remove it, wait 30 seconds, and reseat firmly — this resets the cradle's detection logic. If the cell measures below 3.0V with a multimeter, a brief trickle-charge from a compatible Li-Po charger at 0.1C will bring it above the BMS acceptance floor.