About this replacement
TomTom GO 5100 / GO 6100 Series — 3.7V Li-ion Replacement Battery (VFAD)
This is a 3.7V, 1100mAh Li-ion cell replacing the original VFAD battery in the TomTom GO 5100, GO 6100, 4FL50, 4FL60, and related models. It powers the touchscreen display, GPS receiver, and real-time traffic processing. Voltage and capacity match the original spec exactly — no modification needed.
- GO 5100 and GO 6100 compatibility: Both the 5-inch and 6-inch models in this TomTom GO generation share the same VFAD cell, connector pinout, and BMS communication protocol. One battery fits both screen sizes because the power rail is identical across the platform.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on GO series hardware. The BMS accepted the cell without fault codes, balanced correctly on the first full charge, and held voltage within spec across the discharge curve.
- Cold-start satellite acquisition after swap: After fitting this cell, power the GO fully on outdoors before driving. A full power interruption clears the GPS receiver's ephemeris data, triggering a cold start. First satellite fix takes 5–10 minutes outdoors — subsequent warm starts drop under a minute once the almanac rebuilds.
GPS accuracy reduced at low battery on the GO 5100
When cell voltage drops toward 3.4V, some GO series units reduce receiver sensitivity to protect remaining charge for the display and processor. The GPS antenna gets less power, which weakens signal acquisition — particularly in urban canyons or under tree cover. This shows as position drift or slower route recalculation. Keeping the battery above 3.6V during active navigation avoids the sensitivity reduction entirely.
GO 5100 shutting off without warning before the battery indicator reads empty
A freshly fitted cell needs one full charge-discharge cycle before the GO's fuel gauge reads accurately. On the first few uses, the device may cut off abruptly because its stored voltage-threshold map still matches the old, degraded cell — not the new one. The shut-off threshold fires early against the new battery's discharge curve. Run one full charge to 4.2V and allow it to discharge to automatic shut-off once, then recharge fully — the gauge recalibrates after that cycle.