About this replacement
TomTom Go 2435 / Go 2535 Series — 3.7V Li-ion Replacement Battery (FKM1108005799)
This is a 3.7V 1000mAh Li-ion cell for the TomTom Go 2435, Go 2435TM, Go 2535, and Go 2535T portable GPS navigators, plus 13 additional Go series variants. It replaces OEM part FKM1108005799 when the original cell can no longer hold a charge or the device fails to power on. Capacity is 1000mAh (3.7Wh), matching the factory specification.
- Go 2435 / Go 2535 platform compatibility: These models share the same battery bay dimensions (43.30 x 35.90 x 6.50mm), the same 3.7V single-cell Li-ion architecture, and an identical connector pinout — so one cell covers the full range without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Go 2435 platform. The BMS accepted charge from the TomTom USB cradle without fault flags, and the protection circuit held cutoff voltage within spec at both low and high temperature extremes.
- First-fix satellite acquisition after fitting: After any full power interruption, the Go 2435 performs a cold GPS start — expect 5 to 10 minutes outdoors for the first satellite lock. Drive the unit outside immediately after power-on and keep it stationary until it acquires a fix. Subsequent warm starts drop to under a minute.
GPS accuracy reduced at low battery on the Go 2435
The Go 2435 receiver chip reduces RF sensitivity when cell voltage drops below approximately 3.5V — a power-saving measure baked into the firmware. The result is a wider position circle and occasional missed turns in dense urban areas. This is not a GPS signal problem; it is a voltage problem. Keeping the battery above 3.6V during navigation restores full receiver sensitivity.
Device shuts off without warning despite the battery indicator showing charge remaining
A degraded original cell skews the Go's fuel-gauge calibration — the software reads percentage against a capacity model that no longer matches the aged cell's real discharge curve. After fitting a fresh 1000mAh cell, the indicator starts over-reading until the device completes one full charge-discharge cycle. Run the battery from 100% down to automatic shutoff once, then charge to 100% without interruption — the indicator recalibrates against the new cell's actual curve.