About this replacement
Golf Buddy Voice GPS Rangefinder — 3.7V Li-Polymer Replacement Battery (YK372731)
This 3.7V 280mAh Li-Polymer cell replaces the original battery in the Golf Buddy Voice GPS Rangefinder, VS4 GPS Rangefinder, and Voice Plus models. It fits the compact internal bay and matches the OEM connector and BMS handshake. Dimensions are 33.00 × 25.90 × 4.30mm — measure your existing cell before fitting if you are unsure of your variant.
- Voice and VS4 series compatibility: These models share the same battery bay dimensions, 3.7V nominal rail, and Li-Polymer BMS profile. The YK372731 and PL482730 part numbers both cross-reference to this cell — either OEM code confirms the correct fit.
- Bench tested on actual hardware: We cycled this cell through charge, standby, and active GPS acquisition states. The BMS held the charge floor at the correct cutoff voltage and did not trip during satellite acquisition draw spikes.
- Cold-start satellite acquisition after fitting: After fitting this cell, power the unit on outdoors and let it acquire a full satellite fix before heading out. GPS devices perform a cold start after any complete power interruption — first fix typically takes 5–10 minutes. Subsequent warm starts run under a minute.
GPS accuracy dropping at the end of a round
Some Golf Buddy units reduce GPS receiver sensitivity as battery voltage falls below a threshold to conserve power. This shows up as yardage readings that update slowly or jump between values on the back nine. A degraded original cell loses voltage headroom faster, pushing the unit into low-power receiver mode earlier in the round. Fitting a fresh cell restores full receiver voltage and keeps sensitivity at its normal operating level throughout 18 holes.
Device shuts off without a low-battery warning
The battery indicator on the Voice series reads state of charge from voltage curves stored during factory calibration. An aged or swollen cell has a flattened discharge curve — voltage stays relatively high until it drops sharply, giving the indicator almost no time to show a warning before the BMS hits cutoff. If the unit is going dark mid-round with no warning, the cell voltage is collapsing faster than the indicator can track. After fitting this replacement, run one full charge-to-cutoff cycle so the unit can re-reference its indicator against the new cell's voltage curve — charge to 4.2V and use until the device shuts off naturally.