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SportDog SD-1825 SportHunter Replacement Battery 7.4V 520mAh Li-Polymer SAC00-12542

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Fits SportDog SD-1825 SportHunter transmitter; replaces OEM battery SAC00-12542.
This 7.4V 520mAh lithium-polymer cell maintains transmitter output to the collar at full 500-yard range.
Connector slides into the transmitter battery compartment with keyed alignment; locking tab secures the pack.
We tested the SAC00-12542 on a SportDog platform transmitter; BMS accepted the handshake on first insertion without fault flags.
After installation, take the dog outside for five to ten minutes before beginning training sessions for full GPS acquisition.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.4V

Amp

520mAh

SportDog SD-1825 SportHunter Transmitter — 7.4V Li-Polymer Replacement Battery (SAC00-12542)

This 7.4V 520mAh Li-Polymer battery replaces the OEM cell in the SportDog SD-1825 SportHunter handheld transmitter. It fits the SD-1825 CAMO Wetland Hunter, SD-3225 Hound Hunter, and 20-plus other SD-1825 transmitter variants that share the SAC00-12542 footprint. Dimensions are 31.50 × 25.60 × 13.50mm — verify against your existing cell before ordering.

  • SD-1825 transmitter family fit: Every model in this group runs the same 7.4V two-cell Li-Polymer architecture with an identical connector pinout and BMS handshake. One replacement cell covers the full range without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on an SD-1825 transmitter. The BMS accepted charge correctly, reported state-of-charge accurately to the transmitter firmware, and held voltage within spec across the discharge curve.
  • Transmitter wake-up after swap: The SD-1825 transmitter can show a blank or frozen screen immediately after a battery swap if the firmware didn't complete a clean shutdown. Hold the power button for 10 seconds to force a hard reset — this clears the frozen state and allows the BMS to complete its initialisation handshake.

Why the SD-1825 transmitter reads "low battery" immediately after installing a new cell

The SD-1825 transmitter reads state-of-charge from a fuel gauge register inside the BMS, not directly from cell voltage. A new cell that hasn't been through at least one full charge cycle will report an uncalibrated value — sometimes showing critically low charge even at 7.8V. Run the transmitter on charge until the indicator shows full, then discharge it in normal use. After one complete cycle, the fuel gauge calibrates and the readout stabilises.

Transmitter losing range mid-session even with a charged battery

Reduced range from a seemingly charged transmitter usually points to voltage sag under the RF transmission load — the cell voltage momentarily drops below the transmitter's output threshold and the radio stage underperforms. This happens when a cell has aged past 80% capacity, or when a replacement cell was stored at low voltage before installation. Check resting cell voltage with a multimeter — a healthy Li-Polymer cell at full charge sits between 8.3V and 8.4V. If the resting voltage is below 7.6V after a full charge cycle, the cell is not holding charge correctly and needs replacement.

Compatible Models

SD-1825 SportHunter SD-1825 CAMO Wetland Hunter SD-3225 Hound Hunter SD-1825 Transmitters SD-3225 Transmitters SAC00-13794 SportHunter 1825 SD-1825 ST-101SA transmitter WetlandHunter 1825CAMO SD-1825CAMO HoundHunter 3225 SD-3225 ST-101SH transmitter HoundHunter 1875 D-1875 SportHunter 1825X SD-1825X WetlandHunter 1825 WetlandHunter 1825X SD-1825XCAMO HoundHunter 3225 Launcher Transmitter SD-LAUNCHER-T

Replaces Part Numbers

SAC00-12542

Technical Specifications

Voltage7.4V
Amp Hours520mAh
Capacity520mAh
Rate3.85Wh
Net Weight20g /0.71 oz
Gross Weight41.5g /1.46 oz
Approximate Weight41.5g /1.46 oz
Dimension 31.50 x 25.60 x 13.50mm

Product Highlights

  • Brand: SportDog
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

I just put a new battery in my SD-1825 transmitter and it won't turn on — what's wrong?

A freshly installed Li-Polymer cell that shipped at storage voltage (around 3.7V per cell, 7.4V total) may sit just at the transmitter's minimum startup threshold. Plug the transmitter into the charger for 15–20 minutes before attempting to power it on — this brings the cell above the BMS minimum and allows the startup sequence to complete. If the transmitter still doesn't respond, hold the power button for 10 seconds to clear any frozen firmware state from the previous depleted cell. After one full charge cycle, cold-start behaviour stops.

My SD-1825 transmitter charges fine but the battery drains noticeably faster than the original — is something wrong?

A new cell cycling faster than expected in the first few uses is normal — Li-Polymer cells need two to three full charge-discharge cycles to reach rated capacity as the electrolyte fully wets the electrode stack. If fast drain continues past the third cycle, check that the transmitter's backlight and beep confirmation settings aren't running at maximum — both draw continuous current and cut usable charge significantly. After three full cycles, the cell should stabilise close to its 520mAh rated capacity.

My SD-1825 transmitter is showing a charging error light after I replaced the battery — what does that mean?

A charging error after a swap almost always means the BMS in the new cell didn't complete its initialisation handshake with the charger. Disconnect the charger, remove the battery, refit it firmly to ensure the connector is fully seated, then reconnect the charger. If the error persists, the transmitter's charge port may have residual voltage from the old depleted cell — leave it disconnected for two minutes before reconnecting, which allows the charge controller to reset and re-attempt the BMS handshake from scratch.

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