Falk IBEX GPS Replacement Battery 3.7V 1100mAh

Falk IBEX Series — 3.7V Li-ion Replacement Battery (CP-FU-NP60-1100CM)

This is a 3.7V Li-ion cell rated at 1100mAh (4.07Wh), built to the same dimensions as the original — 52.20 x 35.30 x 7.10mm. It fits the Falk IBEX, IBEX 30, IBEX 40, and CROSS portable GPS navigators. Swap it in when the original cell no longer holds a charge or causes unexpected shutdowns during navigation.

• IBEX, IBEX 30, IBEX 40, and CROSS compatibility: All four models run the same 3.7V single-cell architecture with an identical connector footprint and BMS handshake. One cell covers the entire IBEX platform without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under a simulated GPS navigation load. The BMS handled charge termination cleanly and held the 3.7V nominal rail without voltage sag at the GPS receiver stage.
• First-fix satellite acquisition after swap: After fitting this cell, power the device on outdoors and let it acquire a satellite fix before driving. Full power removal triggers a cold start — the GPS receiver needs 5–10 minutes for the first fix. Subsequent warm starts drop that to under a minute.

GPS accuracy dropping as the Falk IBEX battery level falls

At low state of charge, the IBEX reduces power to the GPS receiver to stretch remaining runtime. That reduction lowers receiver sensitivity, which narrows the satellite pool the unit can track. Fewer satellites means a weaker position fix and possible drift on the map. Keeping the cell above roughly 3.5V under load maintains full receiver sensitivity and position accuracy.

Falk IBEX shutting off without a low-battery warning

An aged or deeply discharged cell loses accurate state-of-charge tracking — the fuel gauge reads the open-circuit voltage, not true remaining capacity under load. When navigation draws current, voltage sags below the BMS cutoff threshold faster than the indicator updates. The device shuts off while the icon still shows one bar. Charge the new cell to 100% before first use, then run one full discharge cycle to let the gauge recalibrate to the new cell's actual capacity curve.