Vodafone VPA Compact GPS 35H00077-00M Compatible Battery 3.7V 2400mAh

Vodafone VPA Compact GPS — 3.7V Li-Polymer Replacement Battery (35H00077-00M)

This 3.7V, 2400mAh lithium-polymer battery is a direct replacement for the Vodafone VPA Compact GPS. It fits the VPA Compact GPS navigation unit and matches the original cell's voltage rail and connector. OEM part numbers covered: 35H00077-00M, TRIN160, and 35H00077-02M.

• VPA Compact GPS fit: The VPA Compact GPS runs a single-cell 3.7V Li-Polymer architecture. The BMS on this unit monitors cell voltage and temperature via a dedicated sense line — the replacement cell must match the original impedance profile or the fuel gauge IC will log errors and report inaccurate state-of-charge readings.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the VPA Compact GPS platform. The BMS accepted the cell without fault codes, and the charge IC reached full cutoff voltage cleanly at 4.2V.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge accessory and run one complete discharge-to-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter to the new cell's actual discharge curve before any high-current session pushes current into an uncalibrated register.

Why the VPA Compact GPS reports wrong battery percentage after a cell swap

The VPA Compact GPS uses a fuel gauge IC that builds its state-of-charge model against the original cell's internal resistance and discharge curve. When a new cell goes in, the IC is still referencing the old cell's stored profile. Until a full discharge-charge cycle forces the coulomb counter to reset and relearn, the displayed percentage will drift — often reading 20–30% higher or lower than actual charge. Run one full cycle from 100% down to auto-shutdown and back to 100% to trigger recalibration.

Sudden shutdown at 20–30% remaining on the replacement cell

This is a voltage cliff failure. Under GPS radio load or screen backlight draw, the new cell's terminal voltage drops faster than the fuel gauge expects, falling below the BMS cutoff threshold — typically 3.0V — while the displayed percentage still reads 20–30%. The IC has not yet mapped the new cell's voltage-to-capacity curve accurately. One full discharge cycle from 100% to BMS cutoff resolves this by giving the fuel gauge a real load profile to reference on subsequent cycles.