Navigon 5100 GPS Replacement Battery 3.7V 1200mAh

Navigon 5100 / 5100 MAX — 3.7V Li-ion Replacement Battery (541380530001)

This 3.7V 1200mAh Li-ion cell replaces the original battery in the Navigon 5100 and 5100 MAX portable GPS navigators. It matches the OEM part number 541380530001 and fits the existing connector and housing without modification. Capacity figure is 4.44Wh as rated by the manufacturer.

• 5100 and 5100 MAX compatibility: Both units share the same battery bay dimensions, connector pinout, and 3.7V voltage rail. The BMS handshake behaviour is identical across both variants, so one cell covers the full range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the 5100 platform and confirmed the BMS accepted full charge without cutoff errors or protection-circuit trips at standard 5V USB input.
• First-fix satellite acquisition after swap: After fitting this cell, power the GPS fully on outdoors before driving. The unit performs a cold start after any full power interruption — first satellite acquisition can take 5–10 minutes compared to under a minute on a warm start. Let the fix complete before mounting the device in the vehicle.

GPS accuracy dropping when battery charge falls below 20%

The Navigon 5100 reduces receiver sensitivity at low cell voltage to protect core navigation functions. This appears as degraded positioning accuracy or slower route recalculation — not a GPS signal problem but a power-saving response triggered below roughly 3.5V. Replacing a degraded cell that sags early under GPS receiver load restores full sensitivity. After fitting this battery, charge to 4.2V before your first navigation session.

Device shuts off without warning despite showing charge remaining

This happens when the battery indicator is uncalibrated against the new cell. The 5100 reads state-of-charge from a voltage curve learned from the old battery, so the visual gauge still shows bars when the actual cell voltage has already hit the low-voltage cutoff threshold. The BMS then trips and the unit powers off mid-route. Run two full charge-discharge cycles after fitting this cell — the firmware re-learns the curve and the gauge behaviour normalises.