TomTom One GPS Compatible Battery 3.7V 800mAh F650010252

TomTom One / One Europe Series — 3.7V Li-ion Replacement Battery (F650010252)

This 3.7V, 800mAh Li-ion cell replaces the internal battery in the TomTom One, One Europe, One Regional, Rider, and over 22 additional TomTom navigator variants. It fits the compact 44.30 × 34.10 × 5.00mm battery bay and uses OEM part numbers F650010252 and F709070710. Install it when the original cell no longer holds enough charge to power the device through a full navigation session without a USB cable.

• TomTom One platform fit: The One, One Europe, and One Regional all share the same battery bay dimensions, connector pinout, and BMS communication protocol — which is why a single cell covers the full range. The Rider variant uses the same cell inside a ruggedised housing but draws from the identical 3.7V rail.
• Bench tested on actual hardware: We cycled this cell on a TomTom One unit with active GPS lock and display at full brightness. The BMS held a stable discharge curve down to the 3.0V cutoff with no premature trips or false low-battery flags during the run.
• Post-swap cold-start note: After fitting this battery, power the unit on outdoors with a clear sky view before your first drive. Full power removal resets the GPS receiver's almanac data, so the first satellite fix can take 5–10 minutes. Subsequent warm starts drop back under a minute once the almanac is rebuilt.

GPS accuracy dropping at low battery on TomTom One

When the TomTom One's battery voltage falls below roughly 3.5V, the unit reduces power to the GPS receiver module to extend remaining uptime. This cuts receiver sensitivity, which weakens satellite signal acquisition — particularly in urban canyons or under tree cover where signal is already marginal. The result is position jumps, missed turns, or the map freezing briefly mid-route. Replacing the cell restores full receiver voltage and fixes the accuracy drop without any setting changes.

TomTom One shutting off without warning before the battery indicator hits empty

The battery percentage indicator on the TomTom One is calibrated against the original cell's discharge curve. An aged or previously discharged cell has a steeper voltage drop than the firmware expects, so the unit hits its hardware cutoff threshold — around 3.0V — while the screen still shows 20–30% remaining. The warning never triggers because the voltage collapse is faster than the indicator's update cycle. Fitting a fresh cell re-aligns the discharge curve with the firmware's calibration, so the visual indicator and the actual cutoff point match again.