SERIOUX URBAN PILOT UPQ700 Replacement Battery HR504080 3.7V 1500mAh

SERIOUX Urban Pilot UPQ700 — 3.7V Li-Polymer Replacement Battery (HR504080)

This 3.7V, 1500mAh Li-Polymer cell replaces the original HR504080 battery in the SERIOUX Urban Pilot UPQ700 portable GPS navigator. It restores power to the unit when the original cell no longer holds a charge or fails to power the device on. Capacity is 5.55Wh at the same voltage as the factory cell.

• UPQ700 fit: The UPQ700 uses a flat Li-Polymer pouch cell on a 3.7V rail. This HR504080 cell matches the original footprint at 60.00 × 37.40 × 5.40mm, so the connector seats correctly and the cell sits flat in the housing without pressure on the screen assembly.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a GPS navigator platform. The BMS accepted charge from a standard 5V USB input without fault flags, and the protection circuit triggered cleanly at low-voltage cutoff.
• Cold-start satellite acquisition after fitting: After a full power removal, the UPQ700 loses its satellite ephemeris data and performs a cold start. Take the unit outdoors after fitting this battery and allow 5–10 minutes for the first satellite fix. Subsequent warm starts will lock in under a minute once the almanac is cached.

GPS accuracy dropping as battery level falls on the UPQ700

Some GPS navigators reduce RF receiver sensitivity at low battery to cut power draw. On the UPQ700, this can cause position drift or slower route recalculation before the device shuts off. A degraded original cell reaches the low-battery threshold sooner, compressing the window of full-accuracy navigation. A fresh 1500mAh cell keeps the receiver running at full sensitivity for longer into each charge cycle.

UPQ700 shuts off without warning before the battery indicator hits empty

This happens when the original cell has aged enough that its actual capacity no longer matches the charge curve the device's fuel gauge was calibrated against. The navigator reads 30% remaining, but the real voltage drops below the cutoff threshold — around 3.0V — and the unit powers off mid-route. Replacing the cell resets this mismatch. After fitting the new battery, run two full charge-to-discharge cycles so the device can recalibrate its voltage-to-percentage mapping.