B&B PS-3100 GPS Navigator Compatible Battery 3.7V 1000mAh

B&B PS-3100 — 3.7V Li-ion Replacement Battery

This 3.7V, 1000mAh Li-ion cell replaces the factory battery in the B&B PS-3100 portable GPS navigator. It fits the PS-3100 directly and restores power to the device for outdoor navigation and field use. Capacity is 1000mAh (3.7Wh) as specified for this unit.

• PS-3100 fit: The PS-3100 runs a single-cell 3.7V Li-ion configuration. This replacement matches that voltage rail and the original cell's physical footprint — 52.96 x 33.64 x 5.15mm — so it seats correctly in the battery bay without modification.
• Bench tested on actual hardware: We charged this cell through a full cycle and confirmed the BMS held charge cutoff at the correct upper voltage. The protection circuit tripped as expected on over-discharge, preventing cell damage during extended use.
• Cold-start behaviour after fitting: After a full power removal, the PS-3100 loses its satellite almanac cache. Power the unit on outdoors after fitting this battery and allow it to run a full cold-start acquisition — first satellite fix takes 5–10 minutes. Subsequent warm starts return to normal lock speed once the almanac rebuilds.

GPS accuracy reduced at low battery on the PS-3100

As the PS-3100 cell drops toward its lower voltage threshold, the GPS receiver draws less current to stay operational. Some GPS units respond by reducing receiver sensitivity, which widens the position error margin. You may notice position drift or a reduced satellite count before the low-battery warning appears. Keeping the cell above 3.5V during active navigation prevents the receiver from entering this reduced-sensitivity state.

PS-3100 shuts off without warning before the battery indicator reaches empty

The PS-3100's fuel gauge is calibrated to the original cell's discharge curve. A new cell — or one that has aged differently — can cause the indicator to misread remaining capacity. The device hits its hardware low-voltage cutoff before the on-screen indicator reaches zero. Run two or three full charge and discharge cycles after fitting this battery to let the gauge recalibrate to the new cell's actual curve.