Navitel MS700 GPS Compatible Battery 3.7V 1500mAh

Navitel MS700 — 3.7V Li-Polymer Replacement Battery (HR504080)

This 3.7V 1500mAh Li-Polymer cell replaces the OEM HR504080 battery in the Navitel MS700 GPS navigator. It fits the MS700's internal battery bay directly and restores full power to the navigation display, GPS receiver, and map storage. Capacity matches the original at 1500mAh (5.55Wh).

• MS700 platform fit: The HR504080 cell is specific to the MS700's compact battery compartment — 60.00 × 37.40 × 5.40mm. The connector polarity and voltage rail match the MS700 power management circuit, so the device reads charge state correctly from first boot.
• Bench tested on actual hardware: We cycled this cell through the MS700's charge and discharge circuit. The BMS held the cutoff threshold correctly and the device reported charge percentage without erratic jumps across the full discharge curve.
• Cold-start after power interruption: After fitting this cell, power the MS700 on outdoors and let it acquire a satellite fix before driving. The GPS performs a full cold start after any complete power removal — first fix takes 5–10 minutes. Subsequent warm starts drop back under a minute once almanac data is cached.

GPS accuracy reduced as battery voltage drops on the MS700

At low battery, the MS700 scales back receiver sensitivity to reduce current draw. This shows up as increased position scatter or a slower fix when the battery indicator is in the bottom quarter. The GPS receiver requires stable voltage to maintain full signal processing — a degraded original battery causes this even when the indicator reads 20–30%. A fresh HR504080 cell holds the voltage above the threshold the receiver needs for full sensitivity through most of its discharge curve.

MS700 shuts off without low-battery warning

This happens when the battery's actual discharge curve no longer matches the voltage-to-percentage table the MS700 uses to estimate remaining charge. An aged cell loses voltage suddenly in the final 15–20% of capacity, so the device hits the hardware cutoff voltage — around 3.0V — before the software warning triggers. Replacing with a new HR504080 cell re-aligns the discharge curve to what the firmware expects. After fitting, run one full charge cycle to let the indicator recalibrate.