About this replacement
TomTom Go 920 Series — 3.7V Li-Polymer Replacement Battery (AHL03713100)
This 3.7V, 1300mAh Li-Polymer cell replaces the original battery in the TomTom Go 920, Go 920T, Go XL330, and One XL 340 portable GPS navigators. It fits the same connector and form factor as the factory cell, measuring 62 × 37 × 5mm. Capacity matches the OEM specification at 4.81Wh.
- Go 920 and XL330 platform compatibility: These models share the same battery bay dimensions, connector pinout, and 3.7V BMS voltage threshold — one cell covers the full group without any modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Go 920 unit, confirming the BMS accepted the cell, reported charge state correctly, and held voltage above the device's low-battery cutoff across a full navigation session.
- Cold-start satellite acquisition after fitting: After fitting this cell and powering on, take the unit outdoors before first use. The GPS performs a cold start following any full power removal — expect 5–10 minutes for the first satellite fix. Subsequent warm starts drop to under a minute once the almanac data is cached.
GPS accuracy reduced at low battery on the Go 920
When cell voltage drops below roughly 3.5V, some TomTom Go units scale back GPS receiver sensitivity to reduce current draw and extend operation. The result is position drift or slower route recalculation — not a software fault. Charging the unit restores full receiver power and accuracy returns immediately. If you see this regularly, the cell has likely aged past its usable capacity floor.
Go 920 shutting off without a low-battery warning
This happens when the battery indicator is uncalibrated against the new cell — the device's charge gauge reads the old cell's discharge curve, so the visual warning fires late or not at all. The BMS still trips at its hard voltage cutoff, cutting power instantly. To recalibrate, run the unit from full charge until it shuts off on its own, then charge uninterrupted back to 100%. One full cycle is usually enough for the indicator to track correctly against the new cell's actual voltage curve.