Falk IBEX 25 GPS Replacement Battery 3.7V 1800mAh

Falk IBEX 25 / IBEX 32 — 3.7V Li-ion Replacement Battery (1674830000)

This 3.7V 1800mAh Li-ion cell replaces OEM part 1674830000 in the Falk IBEX 25, IBEX 25 Touring, and IBEX 32 handheld GPS navigators. It matches the original cell's footprint at 52.10 × 51.00 × 6.50mm and drops into the battery bay without modification. Capacity is rated at 6.66Wh, identical to the factory spec.

• IBEX 25, IBEX 25 Touring, and IBEX 32 compatibility: All three models use the same battery bay dimensions, connector pinout, and BMS voltage thresholds. The 1674830000 part number covers the full series, so one cell fits across all three variants without any wiring or adapter changes.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the IBEX platform and monitored BMS handshake at each stage. The protection circuit triggered correctly at low-voltage cutoff and accepted a standard charge current without fault flags.
• Cold-start tip after fitting: After installing this cell, take the unit outdoors and power it on before your first route. Removing the battery clears the GPS receiver's ephemeris data, so the device performs a cold start — expect the first satellite fix to take 5–10 minutes. Subsequent power cycles will lock on much faster once the almanac is rebuilt.

Why the IBEX 25 shuts off without warning at low battery

The IBEX 25 reads the battery indicator from a stored voltage curve calibrated to the original cell. After a battery swap, that curve is no longer accurate until the device logs a full discharge cycle. Until then, the on-screen indicator may show one bar remaining while the actual cell voltage is already at the BMS cutoff threshold — typically around 3.0V for this chemistry. The result is an abrupt shutdown with no low-battery warning. Run one full charge-to-cutoff cycle after fitting the new cell to recalibrate the indicator.

GPS accuracy dropping noticeably during long navigation sessions

Some Falk IBEX units reduce GPS receiver sensitivity as cell voltage falls below approximately 3.4V, shedding power draw from the radio front-end to extend operation. This shows up as position jumps or a wider accuracy circle on the map — not a fault with the GPS module itself. Charging the battery back above 3.7V restores full receiver sensitivity. If accuracy problems appear early in a session, check that the cell seated fully and the connector contacts are clean.