About this replacement
SportDog YardTrainer YT-100 Series — 3.7V Li-Polymer Replacement Battery (SDT54-16718)
This 3.7V, 190mAh Li-Polymer battery replaces the original cell in the SportDog YardTrainer YT-100 and YT-100S training collars. It fits the collar receiver units (SDT54-16683 and SDT54-16684) that handle remote stimulation signals during obedience training sessions. Dimensions are 25.90 × 20.50 × 5.30mm — measure your existing cell before ordering.
- YT-100 and YT-100S collar fit: Both collar variants share the same receiver housing, connector pinout, and BMS handshake, so one cell covers the full YT-100 platform without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the YT-100 receiver board. The BMS accepted the cell without fault flags, and charge termination triggered cleanly at 4.2V.
- First-use activation on the collar: After installing, power on the collar and place it outdoors for a full re-pairing cycle with the remote — the receiver resets its communication link after a power interruption and needs an active signal exchange to confirm pairing before training.
Why the YT-100 collar stops responding mid-session after a battery swap
The YT-100 receiver uses a low-voltage cutoff in the 3.4–3.5V range. A cell with even moderate capacity fade can sag below that threshold under the brief current spike of a stimulation pulse, causing the collar to cut out without warning. A fresh 190mAh cell holds voltage more consistently under pulse load. If cutouts continue after fitting a new cell, check that the connector is fully seated — a partial connection adds resistance and makes sag worse.
Collar not pairing to the remote after installing a new battery
A full power interruption clears the receiver's active pairing state. The collar does not automatically re-establish the link just because it powers on. You need to run the manual pairing sequence — hold the pairing button on the remote until the collar LED confirms the link. Check your transmitter is within 10 feet during this step, as the initial handshake uses a lower power signal than normal operating range.