Educator ET-300 Receiver Compatible Battery 3.7V 300mAh Li-Polymer PL-711828

Educator ET-300 / ET-302 Receiver — 3.7V Li-Polymer Replacement Battery (PL-711828)

This 3.7V 300mAh Li-Polymer battery replaces the original cell in the Educator ET-300 and ET-302 Receiver collar units. It fits the standard and long-range (-L) variants across both the ET-300 and ET-302 lines. Voltage and physical dimensions match the OEM spec — 30.20 x 18.24 x 7.20mm.

• ET-300 and ET-302 Receiver compatibility: Both the ET-300 and ET-302 receiver housings use the same battery bay dimensions and 3.7V power rail. The BL-100 and BP-504 cross-reference numbers cover the same cell used across these collar variants, including the long-range -L versions.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the receiver unit. The BMS accepted full charge without flagging an incompatible cell, and the collar powered on cleanly with no fault indication on the transmitter pairing sequence.
• First power-on after installation: After swapping the battery, take the dog outside and allow 5–10 minutes before expecting the receiver to respond at full range. The collar's control circuit performs a cold initialisation after any power interruption, and indoor re-assembly can delay that sequence.

Why the ET-300 Receiver loses transmitter pairing after a battery swap

The ET-300 Receiver stores its paired transmitter ID in volatile memory backed by the battery. When the cell drops below the retention threshold — or is fully removed — that pairing data can clear. After installing this replacement battery, the collar will not respond to stimulation commands until re-paired. Power on both units, hold the pairing button on the transmitter, and confirm the collar LED acknowledges the link. This is not a fault with the battery — it is standard behaviour after any power interruption to the receiver circuit.

Receiver LED flashes but collar delivers no stimulation

A flashing LED with no stimulation output usually means the cell voltage is above the minimum boot threshold but below the level the output stage needs to fire. On a 3.7V Li-Polymer cell, that gap sits roughly between 3.2V and 3.5V — the collar appears on but cannot deliver a full output pulse. Charge the replacement cell completely before first use; a cell shipped at partial charge can land in exactly this window. If the symptom persists after a full charge cycle, check the connector contacts on the receiver board for any oxidation from the old cell.