About this replacement
Navigon 72 Easy / 72 Plus Live — 3.7V Li-ion Replacement Battery (541384120003)
This 3.7V 1000mAh lithium-ion cell replaces the original battery in the Navigon 72 Easy and 72 Plus Live portable GPS navigators. It matches the OEM spec at 3.7Wh and fits the 53.26 × 34.16 × 5.68mm battery bay directly. When the original cell degrades, the unit either shuts off mid-route or fails to hold charge long enough for a useful journey.
- 72 Easy and 72 Plus Live fitment: Both models share the same battery bay dimensions, connector orientation, and voltage rail. The BMS in each unit reads the same charge profile, so one cell covers both without any modification.
- Bench tested on actual hardware: We ran the cell through full charge and discharge cycles on a 72 Easy unit. The BMS accepted the charge curve without fault codes, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- Cold-start satellite acquisition after fitting: After any full power interruption, the GPS receiver loses its ephemeris data and must perform a cold start. Take the unit outdoors immediately after powering on and hold it stationary — first satellite fix can take 5–10 minutes. Subsequent warm starts drop back under a minute once the almanac rebuilds.
GPS accuracy reducing as battery charge drops
Some Navigon units step down GPS receiver sensitivity at low charge to reduce current draw. This shows up as position drift or wider accuracy circles on the map before the unit actually shuts off. The receiver is still running, but it has stopped using weaker satellite signals to conserve power. Keeping the cell above 3.5V under load maintains full receiver sensitivity.
Unit shutting off without the low-battery warning appearing
After a battery swap, the fuel gauge in the 72 Easy is uncalibrated against the new cell. The unit calculates remaining charge from voltage, and a fresh cell may have a slightly different discharge curve than the original. This means the voltage threshold for shutdown can be reached before the on-screen indicator shows critical. Run two full charge-to-shutdown cycles to let the unit recalibrate its voltage-to-charge mapping against the new cell.