SiRF HXE-W01 GPS Receiver Replacement Battery 3.7V 1000mAh

SiRF III High Sensitivity Bluetooth GPS Receiver — 3.7V Li-ion Replacement Battery (HXE-W01)

This 3.7V, 1000mAh Li-ion cell replaces the original battery in the SiRF III High Sensitivity Bluetooth GPS Receiver. It slots into the compact HXE-W01 unit, restoring power to the GPS receiver and Bluetooth transmitter. Dimensions are 52.96 × 33.64 × 5.15mm — measure your existing cell before ordering if you are unsure.

• HXE-W01 platform fit: The SiRF III receiver runs a single 3.7V Li-ion cell with a low-current BMS — no motor load, no high-draw spikes. The BMS here is tuned for steady low-draw GPS and Bluetooth operation, not power tools or radios, so the discharge profile stays flat across the navigation session.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the GPS receiver, confirmed stable 3.7V nominal output, and verified the BMS did not trigger a false over-discharge cutoff during normal GPS acquisition and Bluetooth pairing loads.
• First-fix after power interruption: After fitting this cell, power the unit on outdoors and let it acquire a satellite fix before relying on it for navigation. The GPS performs a cold start after any full power removal — first fix takes 5–10 minutes. Subsequent warm starts drop to under a minute once the almanac is rebuilt.

GPS accuracy reduced as battery voltage drops below threshold

The SiRF III chipset can reduce receiver sensitivity when the supply voltage sags toward the low-battery cutoff. This happens because the RF front-end draws more current during active satellite tracking, pulling voltage down faster than the device indicator reflects. The result is fewer satellites locked and a wider position error circle — even while the battery indicator still shows one bar. If accuracy degrades noticeably, check that the cell voltage under load is at or above 3.5V before attributing the issue to signal environment.

Device shuts off without warning before battery indicator reaches empty

This happens when the fuel gauge or voltage-threshold logic has not recalibrated to the new cell's actual discharge curve. The original cell, after years of use, had a steeper voltage drop at end-of-charge — the device learned that curve. A fresh 1000mAh cell holds voltage flatter for longer, then drops sharply, tripping the hardware cutoff before the visual indicator catches up. Run two or three full charge-to-cutoff cycles to let the device recalibrate. After that, the low-battery warning should appear well before shutdown, and the cutoff threshold should stabilise at approximately 3.0V.