Callaway uPro GPS Replacement Battery 3.7V 750mAh

Callaway uPro / uPro Go — 3.7V Li-ion Replacement Battery (30200 / GPS305CA)

This 3.7V 750mAh Li-ion cell replaces the original battery in the Callaway uPro and uPro Go handheld golf GPS navigators. It matches the OEM voltage, capacity, and 53.9 × 33.8 × 4.60mm footprint. Fits the existing connector and battery bay without modification.

• uPro and uPro Go compatibility: Both models share the same battery bay dimensions, connector pinout, and 3.7V supply rail. One cell covers both — no BMS handshake difference between the two variants.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the uPro platform. The BMS accepted charge without fault flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold before cell damage could occur.
• First outdoor power-on after fitting: After installing this cell, power the uPro fully on outside and let it acquire a satellite fix before heading to the first tee. The device performs a cold start after any full power interruption — first fix can take 5–10 minutes outdoors, compared to under a minute for subsequent warm starts.

GPS accuracy drops at low battery on the uPro

When cell voltage falls below roughly 3.5V, the uPro's receiver reduces sensitivity to stay within power budget. This shows up as wider distance readings or slower green-line updates — not a GPS signal problem, but a power-management response. The fix is a fresh or fully charged cell before a round. A battery that no longer holds charge above 3.5V under load should be replaced, not recharged.

uPro shuts off without low-battery warning

The on-screen battery indicator in the uPro is calibrated against the original cell's discharge curve. An aged or new-but-different-capacity cell can cause the indicator to misread state-of-charge, meaning the device hits the voltage cutoff while the icon still shows bars remaining. This is a calibration drift issue, not a fault with the replacement cell. After fitting this battery, run two or three full charge-to-cutoff cycles to let the indicator recalibrate against the new cell's actual discharge curve.