Airboard 4000 GPS Replacement Battery 3.7V 1400mAh

Airboard 4000 — 3.7V Li-Polymer Replacement Battery

This 3.7V 1400mAh Li-Polymer cell replaces the original battery in the Airboard 4000 GPS navigator. It restores power to the handheld unit used for outdoor navigation and location tracking. Capacity is 1400mAh (5.18Wh) — matching the original specification.

• Airboard 4000 fitment: The 4000 uses a slim Li-Polymer cell with tight dimensional tolerances inside its sealed housing. This cell measures 66.25 x 50.85 x 3.96mm — matching the bay exactly so the back cover seats flush and the connector aligns with the board.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the GPS platform and confirmed the BMS communicates correctly with the device. The unit powered on cleanly, held charge through active navigation, and showed no false low-battery alerts during testing.
• Cold-start satellite acquisition after swap: After fitting this cell, power the GPS on outdoors before your first trip. The unit performs a cold start after any full power interruption — first satellite fix takes 5–10 minutes. Subsequent warm starts drop to under a minute once almanac data is cached.

GPS accuracy dropping at low battery on the Airboard 4000

As cell voltage falls toward the lower threshold, the Airboard 4000 reduces receiver sensitivity to conserve power. This shows up as wider position scatter or brief signal loss — not a GPS signal problem, but a power management response. A degraded original battery spends more time in this low-voltage range, making the problem chronic. A fresh cell at full charge keeps the receiver running at full sensitivity throughout your session.

Airboard 4000 shutting off without a low-battery warning

The on-screen battery indicator on the 4000 is calibrated against the charge curve of a new cell. A degraded battery drops voltage sharply under load, hitting the hardware cutoff before the indicator reaches the warning threshold. The device powers off mid-navigation with no visible warning. Fit this replacement cell and the indicator re-aligns with actual remaining capacity — the warning reappears at the correct point above 3.4V before cutoff.