About this replacement
TomTom Go 750 Series — 3.7V Li-ion Replacement Battery (VF1A)
This is a 3.7V, 1100mAh Li-ion cell replacing part number VF1A in the TomTom Go 750, Go 750 Live, Go 740 Live, and 4CP0.002.06. It fits the portable sat-nav's original battery bay without modification. Capacity is 1100mAh — matching the factory specification.
- Go 750 and 740 Live compatibility: These models share the same 3.7V battery bay, connector pinout, and charge-management circuit. The Go 750 Live variant uses identical hardware — there is no separate cell for the Live-enabled unit.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on a Go 750 unit. The onboard charge controller accepted the cell immediately, BMS communication was clean, and the device reached a full charge state without fault flags.
- Cold-start satellite acquisition after swap: After fitting this cell, power the GPS fully on outdoors before driving. The device performs a cold start after any complete power interruption — first satellite fix takes 5–10 minutes. Subsequent warm starts lock in under a minute. Do not judge the battery or receiver by first-fix performance immediately post-swap.
GPS accuracy reduced at low battery on the Go 750
As the Go 750's cell voltage drops toward the lower threshold, the device reduces power to the GPS receiver module to extend operation. This cuts receiver sensitivity — the unit may drop to fewer satellites or show position drift that wasn't present at full charge. If navigation accuracy degrades noticeably mid-route, check the battery indicator first. A fresh cell running at 3.7V nominal restores full receiver power and position accuracy.
Go 750 shutting off without warning before the indicator shows empty
The Go 750 calibrates its battery gauge against the original cell's discharge curve. A new cell may trigger the BMS low-voltage cutoff before the onscreen indicator visually reaches empty — the gauge is reading incorrectly, not the battery. Run two or three full charge-to-cutoff cycles and the gauge recalibrates to the new cell's actual curve. After recalibration, the low-battery warning appears at the correct threshold near 3.4V.