TomTom Go 950 Replacement Battery AHL03711008 3.7V 1100mAh

TomTom Go 950 Series — 3.7V Li-ion Replacement Battery (AHL03711008)

This 3.7V, 1100mAh Li-ion cell replaces the original battery in the TomTom Go 950 and Go 950 Live portable GPS navigators. It fits both the standard Go 950 and the Live variant, covering device codes 4CP9.002.00 and 8CP9.011.10. Dimensions are 53.50 × 34.11 × 5.50mm — check these against your original cell before fitting.

• Go 950 and Go 950 Live compatibility: Both models share the same battery bay dimensions, connector pinout, and voltage rail. The BMS in each accepts this cell without modification or firmware changes.
• Bench tested on actual hardware: We ran this cell through a full charge cycle on the Go 950 platform. The BMS accepted charge without fault, voltage held stable at 3.7V nominal, and the device completed a full boot sequence and satellite acquisition normally.
• Cold-start handling after battery swap: After fitting this cell, power the unit on outdoors and let it run until it acquires a satellite fix. The Go 950 performs a cold start after any full power interruption — first fix typically takes 5–10 minutes. Subsequent locks will be much faster once almanac data is cached.

GPS accuracy dropping at low battery on the Go 950

The Go 950's receiver draws consistent power to maintain satellite signal sensitivity. When cell voltage drops toward the lower threshold, some units reduce receiver sensitivity to protect remaining capacity. This shows as position drift, lane-guidance errors, or signal loss on tree-lined roads — symptoms that disappear when the device is running at full charge. If you notice accuracy degrading before the low-battery icon appears, the original cell has likely lost capacity and no longer holds its rated voltage under load.

Go 950 shutting off without warning before the battery indicator empties

This happens when the battery gauge is no longer calibrated to the actual cell. The fuel gauge tracks voltage curves from the original cell — when that cell ages, the discharge curve flattens and then drops sharply, cutting power before the indicator reaches zero. After fitting a new cell, run it through two or three full charge-and-discharge cycles to allow the gauge to re-map against the replacement cell's actual voltage curve. Charge fully to 4.2V, then let the device run on battery until it shuts itself off, and repeat.