Navman iCN 510 Replacement Battery 3.7V 1350mAh

Navman iCN 510 / iCN 520 / iCN 530 / iCN 550 — 3.7V Li-ion Replacement Battery (E3MT07135211)

This 3.7V 1350mAh Li-ion cell replaces part number E3MT07135211 in the Navman iCN 510, iCN 520, iCN 530, and iCN 550 portable GPS navigators. It matches the original voltage and physical footprint at 51.46 × 36.14 × 6.25mm. Capacity is rated at 5Wh, consistent with the OEM specification for this navigator series.

• iCN 510 / 520 / 530 / 550 compatibility: These four models share the same battery bay dimensions, connector pinout, and 3.7V power rail, which is why a single cell covers the entire group. The BMS on each unit reads the same charge termination voltage, so no handshake mismatch occurs on fitment.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the iCN platform and confirmed the BMS accepted the cell without triggering a fault state. Charge termination occurred cleanly at 4.2V and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Cold-start satellite acquisition after fitting: After fitting this cell and powering on, take the unit outdoors with a clear sky view before first use. A full power interruption clears the GPS receiver's ephemeris data, forcing a cold start that can take 5–10 minutes to acquire a fix — subsequent warm starts drop to under a minute once that data is cached again.

Saved routes and POIs disappearing after a battery swap on the iCN 510

The iCN series stores certain user data — saved routes, favourites, and some POI lists — in battery-backed RAM rather than flash memory. When the battery is fully removed, that RAM loses power and the data is wiped. This is not a fault with the replacement cell; it is a characteristic of the hardware. Before removing the old battery, export any saved routes to the SD card via the device's data management menu — that copy survives the swap.

iCN 510 shutting off without a low-battery warning

After fitting a new cell, the fuel gauge on the iCN platform is uncalibrated — it still reads state-of-charge against the worn discharge curve of the old battery. The device's low-battery indicator can trigger late or not at all, and the unit hits the BMS undervoltage cutoff (around 3.0V) with no visual warning. Run two or three full charge-to-cutoff cycles to let the gauge recalibrate against the new cell's actual discharge curve. After that, the warning indicator should appear at the correct threshold again.