Dunlop NAVI 6000 GPS Replacement Battery 3.7V 1250mAh

DUNLOP NAVI 6000 — 3.7V Li-ion Replacement Battery

This 3.7V 1250mAh Li-ion cell replaces the internal battery in the DUNLOP NAVI 6000 portable GPS navigator. It fits the original battery bay directly and restores power to the GPS receiver, display, and onboard memory. Capacity matches the factory spec at 1250mAh (4.63Wh).

• NAVI 6000 fit: The NAVI 6000 uses a single-cell 3.7V Li-ion pack with a compact footprint — 50.00 × 36.60 × 6.60mm. This cell matches those dimensions and the voltage rail the device's power management circuit expects. A mismatch in cell thickness is the most common cause of a poor connector seat on this unit.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a GPS navigator test rig. The BMS responded correctly to charge termination and held the low-voltage cutoff above the threshold that triggers the NAVI 6000's hard shutdown. No false protection trips occurred during the test cycle.
• Cold-start satellite acquisition after fitting: After fitting this cell and powering on, take the NAVI 6000 outdoors before first use. A full power interruption triggers a cold start — the receiver has lost its last known position and almanac cache, so first satellite lock will take noticeably longer than normal operation.

GPS accuracy reduced when battery charge drops below 20%

Some portable GPS units, including the NAVI 6000, reduce RF receiver sensitivity at low battery to protect remaining charge for the CPU and display. This shows up as a position jumping or a weaker satellite count in the signal bar. It is not a hardware fault — it is a power management decision made by the device firmware. Keeping the battery above 3.6V under load avoids this threshold.

NAVI 6000 shuts off without warning at what looks like half charge

The battery charge indicator on the NAVI 6000 reads from a voltage curve that is calibrated to the original cell's internal resistance. An aged or mismatched cell causes voltage to sag under the GPS receiver's draw, hitting the shutdown threshold before the display shows a low-battery warning. The device cuts power at approximately 3.4V under load. After fitting a fresh cell, run two full charge-discharge cycles so the device can recalibrate its voltage-to-percentage mapping.