SportDOG SD-425X / SD-825X Receiver Battery Dying? Replace SAC54-13735 — Keep the DryTek Seal Intact

SportDOG collar receiver losing power mid-hunt or failing under stimulation load? Don’t buy a new $200 system—swapping the SAC54-13735 cell is simple, preserves DryTek waterproofing, and restores full field performance.

If your SportDOG FieldTrainer 425X, 425XS, or SportHunter 825X collar receiver:

  • Loses charge in the middle of a training or hunting session
  • Shows a green full-charge LED but fails to deliver stimulation
  • Takes hours to charge only to drain within minutes
  • Shows "charged" on the cradle, but your dog receives no correction

…the collar receiver is not ruined. The internal 3.7V Li-Polymer battery (OEM part SAC54-13735) has simply aged out after 2–3 hard seasons of field use.

STARNOVO keeps this dedicated pet training replacement cell in continuous production:

Compatible Replacement: 3.7V 200mAh Li-Polymer SAC54-13735 Replacement Battery for SportDOG SD-425X, SD-825X & FieldTrainer Receivers

1. What Battery Does the SportDOG Receiver Use?

Technical specifications for the OEM-spec replacement cell:

  • Voltage: 3.7V
  • Capacity: 200mAh
  • Chemistry: Lithium Polymer (Li-Po)
  • OEM part number: SAC54-13735
  • Safety features: Built-in PCM protection against overcharge, over-discharge, and short circuits
  • Compliance: Tested to UN38.3, IEC62133, UL 2054, and RoHS safety standards

2. Supported SportDOG Training Collar Models

This replacement cell fits across the entire SportDOG field receiver family:

  • FieldTrainer series: FieldTrainer 425, 425S, 425X, 425XS
  • SD-425 variants: SD-425, SD-425 Camo, SD-425E, SD-425S
  • WetlandHunter: WetlandHunter 425 Camo
  • SportHunter series: SportHunter 825, 825X
  • SR series: SR-225, SR-225S, SR-225W
  • Add-A-Dog receivers: SDR-AFE, SDR-AXF
  • SD-575 & SD-875: SD-575, SD-875 receiver collars

Verification Tip: Always open the battery door and verify the label on your existing cell reads SAC54-13735 before ordering.

3. SportDOG Receiver Battery Replacement — Step-by-Step Guide

Replacing the receiver battery takes under 10 minutes with basic precision tools:

  1. Remove the securing screws from the bottom of the collar receiver.
  2. Lift off the exterior battery cover carefully.
  3. Remove the old perimeter rubber gasket, internal plastic cover, and depleted battery.
  4. Drop in the new STARNOVO 3.7V 200mAh cell, ensuring contact orientation matches the original pack.
  5. Install the rubber gasket into the perimeter channel, ensuring it sits completely flat with zero twists or pinches.
  6. Reinstall the inner plastic cover and the outer battery door.
  7. Tighten all screws evenly in an alternating pattern — do not overtighten the small screw heads.
  8. Charge the collar on its dock for 2–3 hours before heading into the field.

Critical Waterproofing Note: The rubber gasket is the single most vital component. A twisted or dirty seal destroys DryTek waterproofing, allowing rain, mud, or pond water to corrode the internal electronics.

Re-pairing Tip: If the collar shows no response to the handheld after a battery swap, it simply dropped pairing when power was removed. Re-pair collar and transmitter within 1 meter, then verify low-level stimulation before outdoor training.

4. When a New Battery Won't Solve the Issue

Skip the battery swap if your collar exhibits any of the following hardware failures:

  • No power LED: Receiver will not light up even when placed directly on a verified charging cradle.
  • Corroded charging pins: The exterior brass charging contacts are severely melted or corroded through.
  • Damaged PCB: The internal board emits a burnt odor or the stimulation high-voltage transformer is blown.
  • Cracked gasket channel: The plastic sealing groove is cracked, preventing an airtight seal.

These symptoms represent housing or board-level failures that a new battery cannot fix.

5. Why Dog Trainers & Outriggers Choose STARNOVO SAC54-13735

  • Exact OEM architecture: Factory-spec 3.7V / 200mAh Li-Po dimensions designed to fit the SportDOG battery cavity perfectly.
  • Integrated PCM circuitry: Built-in board prevents overcharge, over-discharge, overcurrent, and short circuits.
  • Certified safety: Comprehensive certification including UN38.3, IEC62133, UL 2054, and RoHS compliance.
  • Gasket-friendly profile: Precision form factor ensures seamless perimeter gasket sealing to preserve full DryTek waterproofing.
  • 12-Month warranty: Direct manufacturer backing with 30-day DOA coverage.
  • Photo fit verification: Email a photo of your old battery to our team for confirmation within 24 hours.
  • Wholesale & bulk supply: Dedicated stock and volume pricing available for working dog trainers via sales@starnovo.com.
Get the SportDOG SAC54-13735 Replacement Battery →
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