About this replacement
Swing Caddie SC300 — 3.7V Li-Polymer Replacement Battery (ET4968116PA)
This 3.7V, 4750mAh Li-Polymer cell replaces the internal battery in the Swing Caddie SC300 portable golf launch monitor and trainer. It restores power to the unit's GPS receiver, display, and shot-tracking functions. OEM part number ET4968116PA confirms the correct cell for this device.
- SC300 platform fit: The SC300 uses a single flat Li-Polymer cell with a specific connector and BMS handshake. This replacement matches the 111 x 64 x 6mm cell geometry, the voltage rail, and the protection circuit spec the SC300 firmware expects — so charge state reporting on-screen stays accurate.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles with the SC300's BMS active. The protection circuit tripped correctly at both the low-voltage cutoff and the charge termination threshold — no false shutoffs, no runaway charge events.
- First-use GPS initialisation: After fitting this cell, power the SC300 fully on outdoors before your round. The unit performs a cold-start GPS acquisition after any full power interruption — allow 5 to 10 minutes for the first satellite fix. Subsequent warm starts lock on in under a minute.
GPS accuracy reduced when the SC300 battery runs low
The SC300's GPS receiver draws more current during active satellite tracking than during standby. As cell voltage drops toward the lower end of the 3.7V nominal range, some GPS units reduce receiver sensitivity to protect the remaining charge budget. This shows up as yardage readings that refresh more slowly or jump between distances. Keeping the cell above 3.5V under load — which a new 4750mAh cell sustains longer — keeps the receiver running at full sensitivity.
SC300 shuts off without warning instead of showing a low-battery alert
This happens when the fuel gauge calibration drifts after a worn cell is replaced. The SC300's charge indicator was calibrated to the old cell's discharge curve, so it reads higher than the actual voltage until the new cell is fully cycled. The BMS hits its hardware cutoff — typically around 3.0V — before the on-screen warning fires. Run two full charge-to-discharge cycles outdoors and the indicator will recalibrate to the new cell's curve.