SportDog DC-26 Prohunter SD-2400 Replacement Battery 12V

SportDog Prohunter SD-2400 / ST100-P / SWR-1 — 12V Ni-MH Replacement Battery (DC-26)

This is a 12V, 300mAh Ni-MH replacement battery for the SportDog Prohunter SD-2400, ST100-P, and SWR-1 remote training collar receivers. It replaces OEM part numbers DC-26, MH700AAA10YC, and 650-053. When the original cell degrades and the collar loses charge or won't power on, this swap restores operation.

• SD-2400, ST100-P, and SWR-1 compatibility: These three collar receivers share the same 12V Ni-MH cell format, connector pinout, and physical housing dimensions — a single battery spec covers all three. No adapter or wiring modification is needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SD-2400 receiver. The BMS accepted the charge without fault codes, and the collar powered on and held signal through simulated transmission events at full range.
• First power-on after installation: Take the collar outside immediately after fitting the new battery. Ni-MH cells in training collars can sit in storage for months — give the receiver a full charge cycle before the first training session to let the cell stabilise at its rated 300mAh capacity.

Why the SD-2400 receiver loses signal range on a new battery

A freshly installed Ni-MH cell that hasn't completed a full charge cycle delivers slightly lower terminal voltage than a conditioned cell. The SD-2400 transmitter circuit is sensitive to this — you may notice reduced effective range until the battery has gone through one or two complete charge and discharge cycles. This isn't a fault with the replacement cell. Run one full charge before field use, and range will return to spec. If reduced range persists after two cycles, check the antenna contact on the receiver housing for corrosion or debris.

Collar powers on but stops responding to remote commands after a few minutes

This typically happens when the Ni-MH cell has a high internal resistance — common in aged original batteries, but also in replacement cells that have been stored too long. High resistance causes voltage to sag under the brief current draw of the stimulation circuit, triggering a low-voltage cutoff in the receiver. Check the resting voltage of the charged battery at the cell terminals: a healthy 12V Ni-MH pack should read between 13.2V and 14.4V fully charged. If the reading is below 12.5V at rest, the cell is not accepting a full charge and needs to be replaced.