About this replacement
Becker Traffic Assist 7928 — 3.7V Li-ion Replacement Battery (BP-LP1100/12-A1)
This 3.7V, 2100mAh Li-ion cell replaces the original battery in the Becker Traffic Assist 7928 and BE7928 portable GPS navigator. It matches the OEM part number BP-LP1100/12-A1 and fits the device's connector and battery bay without modification. Capacity is taken directly from the product specification at 7.77Wh.
- Traffic Assist 7928 and BE7928 fit: Both model references share the same chassis, battery bay dimensions, and connector pinout. The BP-LP1100/12-A1 part number covers both, so a single cell works across the pair without any adaptation.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Traffic Assist 7928 platform. The BMS flagged correct charge termination at 4.2V and held cutoff voltage stable at the low-charge threshold without false trips.
- First power-on after fitting: After installing this cell, take the navigator outside and power it on before driving. A full power interruption forces a GPS cold start — the receiver must download fresh almanac and ephemeris data, which takes up to 10 minutes for the first satellite fix. Subsequent starts will be under a minute.
GPS accuracy reduced at low battery on the Traffic Assist 7928
When the cell drops below roughly 3.5V, the Traffic Assist 7928 reduces power to the GPS receiver to extend operation. This lowers receiver sensitivity, which can cause the unit to drop from a strong multi-satellite fix to a weaker signal set. Position drift and lane-level errors become more likely in built-up areas or under tree cover. Keeping the device charged above 20% prevents the receiver from entering this reduced-sensitivity state.
Traffic Assist 7928 shuts off without warning before the low-battery indicator appears
This happens when a heavily aged original cell has a compressed voltage curve — the device's fuel gauge is calibrated against the original battery's discharge profile. A new cell with a fuller curve can still hit the hardware cutoff voltage before the on-screen indicator reaches the low-battery warning threshold. After fitting this replacement, run two full charge-to-discharge cycles so the device recalibrates its voltage-to-capacity mapping. The warning indicator should align correctly with actual remaining charge after that.