TomTom Go 400 4.3" GPS Replacement Battery VF3H 3.7V

TomTom Go 400 / Via 110 Europe — 3.7V Li-ion Replacement Battery (VF3H)

This is a 3.7V 700mAh Li-ion cell replacing part number VF3H in the TomTom Go 400 4.3", Go 400 Touch, and Via 110 Europe portable GPS navigators. It fits the internal battery slot directly and restores power to the touchscreen navigation unit. Capacity matches the original 2.59Wh specification from the factory.

• Go 400 and Via 110 platform fit: These three models share the same internal battery bay dimensions, connector orientation, and 3.7V power rail. The BMS handshake is consistent across the platform, so the same cell works across all three without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Go 400 unit. The BMS accepted the cell without fault flags, held voltage through the full GPS receiver and display load cycle, and cut off cleanly at the low-voltage threshold.
• Cold-start satellite acquisition after fitting: After fitting this cell and powering on, take the unit outdoors before first use. A full power interruption triggers a GPS cold start — first satellite fix takes up to 10 minutes. Subsequent warm starts drop back under a minute once almanac data is cached.

GPS accuracy dropping at low battery on the Go 400

When the Go 400 battery voltage sags below a threshold — typically around 3.5V under load — the unit reduces GPS receiver sensitivity to lower current draw. This shows up as position drift or the map pin jumping between streets, even in open-sky conditions. It is not a software glitch or antenna fault. Keeping the battery charged above 50% during active navigation keeps the receiver running at full sensitivity.

Go 400 shutting off without warning before the battery indicator hits empty

After a battery swap, the Go 400's fuel gauge is uncalibrated to the new cell. The device tracks remaining charge using voltage curves mapped to the original aged cell, so the cut-off voltage threshold gets triggered while the indicator still shows one or two bars. Run two full charge and discharge cycles on the new battery to let the firmware recalibrate the voltage-to-percentage mapping. After that, the warning indicator will align with the actual remaining charge.