About this replacement
Golf Buddy World / World Color / DSC-GB400 — 3.7V Li-ion Replacement Battery (PI-A05-05)
This 3.7V 1700mAh Li-ion cell replaces the original battery in the Golf Buddy World, World Color, and DSC-GB400 GPS golf rangefinders. It fits units using OEM part numbers PI-A05-05, LI-A1-01, LI-A05-05, and LI-A02-04. Same voltage, same capacity, same connector as the factory cell.
- World, World Color, and DSC-GB400 compatibility: These three Golf Buddy models share the same battery bay dimensions (64.90 × 44.10 × 5.52 mm), voltage rail, and connector pinout. The BMS on each unit accepts this cell without requiring firmware intervention or re-pairing.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a DSC-GB400 unit. The BMS accepted the cell immediately, charge termination triggered correctly at 4.2V, and the low-battery indicator fired at the expected threshold.
- Cold-start satellite acquisition after fitting: After fitting this cell, power the device on outdoors and let it acquire a satellite fix before heading to the first tee. GPS units perform a cold start after full power removal — first fix takes 5–10 minutes. Subsequent warm starts run under a minute.
GPS accuracy dropping at low battery on the Golf Buddy World
When cell voltage drops below roughly 3.5V, some Golf Buddy units reduce receiver sensitivity to protect remaining charge. This cuts the number of satellites tracked and widens the position error — distances to the pin can drift by several yards. The fix is straightforward: a fresh or fully charged cell keeps the receiver running at full sensitivity for the entire round. If you notice yardage figures becoming erratic late in a round, low voltage is the first thing to check.
Device shuts off without a low-battery warning
This happens when the battery indicator is uncalibrated to the cell's actual discharge curve. The fuel gauge reads a safe level while the cell voltage has already dropped to the BMS cutoff threshold — typically 3.0V on these units — so the device powers off with no visual warning. Running two full charge-discharge cycles after fitting the new cell lets the BMS re-learn the discharge curve. After that, the low-battery alert fires at the correct point rather than at shutdown.