About this replacement
Garmin nüLink 2340 / 2390 — 3.7V Li-Polymer Replacement Battery (361-00019-15)
This 3.7V 1200mAh (4.44Wh) Li-Polymer cell replaces part number 361-00019-15 in the Garmin nüLink 2340 and nüLink 2390 portable GPS navigators. It fits the same footprint as the original at 58.03 × 36.43 × 4.96mm. If your unit shuts off unexpectedly or no longer holds a charge through a full navigation session, this swap restores full power capacity.
- nüLink 2340 and 2390 compatibility: Both units run the same 3.7V power rail and use identical battery connectors with the same BMS handshake protocol — one cell fits both without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the nüLink platform and confirmed the BMS accepted the cell, balanced charging terminated correctly, and the low-voltage cutoff triggered at the expected threshold with no false trips.
- Cold-start satellite acquisition after fitting: After fitting this cell, power the unit on outdoors before driving. The GPS performs a cold start after any full power interruption — first satellite fix takes 5–10 minutes versus under a minute for a warm start. Let it acquire a fix while stationary before relying on navigation.
GPS accuracy reduced as battery voltage drops below threshold
The nüLink 2340 manages power draw across multiple subsystems. When battery voltage sags toward the low end, the unit can reduce GPS receiver sensitivity to protect remaining capacity. This shows up as position drift or a widened accuracy circle on-screen — not a satellite or signal problem. Keeping the cell above 3.5V during active navigation avoids this power-management state entirely.
nüLink 2340 shutting off without warning before the battery indicator hits zero
After a battery swap, the fuel gauge on the nüLink 2340 is uncalibrated to the new cell's actual discharge curve. The unit's low-battery cutoff threshold fires before the on-screen indicator has stepped down to one bar. This is not a faulty cell — it corrects itself after two or three full charge and discharge cycles as the gauge learns the new cell's behaviour. Run the battery down to automatic shutoff and recharge fully for each of the first three cycles to recalibrate.