About this replacement
SkyGolf SkyCaddie SGXw / SGX Series — 3.7V Li-Polymer Replacement Battery (GPS0320MG051)
This 3.7V, 2000mAh lithium-polymer cell replaces the original battery in the SkyGolf SkyCaddie SGXw, SGX-W, and SGX GPS rangefinder units. The SGXw is a handheld golf GPS device that shows yardages, hazard distances, and course layouts during a round. At 69.95 × 50.04 × 4.50mm, this cell matches the original form factor and connector for a direct fit.
- SGXw / SGX series compatibility: These models share the same battery bay dimensions, 3.7V supply rail, and OEM connector pinout. The BMS on each unit communicates with the cell to manage charge cutoff and low-voltage shutoff — this cell's protection circuit matches those thresholds.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on GPS hardware at the same voltage class. The BMS accepted the cell without fault codes, charge cutoff triggered correctly at 4.2V, and low-voltage protection engaged before the cell could be damaged by deep discharge.
- First fix after battery swap: After fitting this cell, power the SGXw on outdoors before your round and let it acquire a satellite fix completely. GPS units perform a cold start after any full power interruption — first fix after a battery swap takes 5–10 minutes; subsequent warm starts drop to under a minute once almanac data is cached.
GPS accuracy reduced at low battery on the SGXw
When battery voltage drops toward the lower threshold, the SGXw reduces power to the GPS receiver module to extend remaining charge. This cuts receiver sensitivity, which can cause yardage figures to update more slowly or show slightly erratic readings on tight doglegs or tree-lined holes. The fix is straightforward: charge the unit fully before the round. If yardage data becomes unreliable during play, the battery is likely below 3.5V and needs charging before the next use.
SGXw shuts off without a low-battery warning
After years of use, the original battery's capacity drops well below its rated level, but the device's charge indicator still reads off the voltage curve calibrated to a fresh cell. The result: the indicator shows two bars, then the unit cuts out mid-round with no prior warning. This happens because the BMS hits its voltage cutoff threshold before the visual indicator catches up. Replacing the cell resets the relationship between actual capacity and voltage curve. After the first full charge cycle on the new cell, the indicator will again give accurate early warning before cutoff.