About this replacement
TomTom VIA 1535 / Live 1535 Series — 3.7V Li-ion Replacement Battery (P11P17-14-S01)
This is a 3.7V, 800mAh Li-ion cell replacing part number P11P17-14-S01 in TomTom's VIA 1535, VIA 1535TM, Live 1535, and Live 1535M GPS navigators. It fits a compact portable sat-nav form factor — 43.45 x 37.25 x 5.70mm — and connects directly to the device's existing battery management circuit. Capacity matches the original specification from the product data.
- VIA 1535 and Live 1535 platform: Both the VIA and Live series share the same 3.7V battery rail, connector pinout, and BMS handshake, which is why one cell covers the full range. The Live variant adds live traffic via SIM, but the power draw profile and cut-off thresholds are identical at the battery level.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the VIA 1535 platform. The BMS accepted the cell without fault flags, regulated charge termination correctly at full capacity, and held the low-voltage cut-off at the expected threshold before the device powered down.
- First fix after battery swap: After fitting this cell, power the GPS on outdoors and let it acquire a satellite fix before driving. A full power interruption triggers a cold start — the receiver has lost its last known position and almanac cache, so first lock can take 5–10 minutes. Subsequent starts will return to under a minute once the data is cached again.
GPS accuracy dropping as battery level falls on the VIA 1535
Some TomTom VIA units reduce GPS receiver sensitivity when battery voltage drops below approximately 3.5V. This is a firmware-level power-saving measure, not a fault with the battery itself. You may notice the blue location dot becoming less precise or the device relying more on map-matching rather than direct satellite position. Keeping the battery above that voltage threshold — or connecting to a car charger during long routes — keeps the receiver running at full sensitivity.
VIA 1535 shutting off without the low-battery warning appearing
This happens when the battery indicator is uncalibrated relative to the actual cut-off voltage the BMS enforces. The on-screen gauge still shows one bar of charge, but the cell has already reached the hardware cut-off threshold — around 3.0V — and the device shuts down without warning. After fitting a new cell, run two or three full charge-to-use cycles so the firmware can re-map the voltage curve to the indicator. If the warning still fails to appear, check that the device firmware is on the latest version via TomTom HOME or MyDrive Connect.