About this replacement
Navman iCN720 / iCN750 — 3.7V Li-Polymer Replacement Battery (PS-803262)
This 3.7V 1900mAh Li-Polymer cell replaces the original PS-803262 battery in the Navman iCN720 and iCN750 portable GPS navigators. Both units share the same battery bay dimensions and connector, making this a direct swap. Capacity is 1900mAh (7.03Wh), matching the factory specification.
- iCN720 and iCN750 compatibility: Both models run the same voltage rail and use an identical physical footprint — 63.90 × 31.00 × 8.00mm — with the same connector orientation and BMS handshake protocol, which is why a single cell covers both units.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the iCN750 platform. The onboard BMS accepted the cell without fault flags, held charge termination correctly at 4.2V, and low-voltage cutoff triggered at the expected threshold without premature shutdown.
- First-fix satellite acquisition after swap: After fitting this cell, power the unit on outdoors and let it acquire a satellite fix before driving. A cold start after full power removal can take 5–10 minutes for first lock — this is normal GPS behaviour, not a fault with the battery or unit.
GPS accuracy reduced at low battery on the iCN720
As cell voltage drops toward the low-voltage cutoff threshold, some GPS units reduce receiver sensitivity to protect remaining power for the display and processor. On the iCN720, this can show up as position drift or slower route recalculation before the battery indicator looks critically low. The receiver draws less current at reduced sensitivity, so the device stays on longer but plots less accurately. Replacing a degraded cell restores full receiver power across the entire charge cycle.
iCN720 shuts off without warning before the battery indicator hits empty
This happens when the battery gauge loses calibration — common after the original cell degrades and no longer holds voltage near its rated curve. The device reads remaining capacity from voltage, and a worn cell collapses quickly near 3.4V, hitting the cutoff before the indicator catches up. The fix is to install a new cell and run one complete discharge cycle so the device can re-map the voltage-to-capacity curve. After that cycle, the low-battery warning will fire at the correct threshold again.