Navigon Triansonic PNA 4000 Replacement Battery 3.7V 1250mAh

Navigon Triansonic PNA 4000 — 3.7V Li-ion Replacement Battery (541380530006)

This 3.7V 1250mAh Li-ion cell replaces the original battery in the Navigon Triansonic PNA 4000 portable GPS navigator. It fits the internal battery bay directly, using OEM part references 541380530006 and BL-LP1230/11-D00001U among others. Voltage and capacity match the original specification exactly.

• Triansonic PNA 4000 fit: The PNA 4000 uses a 3.7V single-cell Li-ion pack with a specific connector pinout and physical envelope of 50.00 × 36.60 × 6.60mm. This cell matches all three — connector, dimensions, and voltage rail — so the BMS handshake completes without fault codes or charge refusal.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a GPS navigator test rig. The BMS reached full charge cutoff cleanly, held voltage through the discharge curve, and showed no premature low-voltage trips at the protection threshold.
• Cold-start acquisition after fitting: After installing this battery and powering on the PNA 4000, take the unit outdoors and leave it running. The GPS performs a full cold start following any complete power interruption — first satellite fix can take 5–10 minutes. Subsequent warm starts drop back under a minute once almanac data is cached.

GPS accuracy reduced at low battery on the PNA 4000

When cell voltage drops toward the lower end of the discharge curve, the PNA 4000 can reduce receiver sensitivity to conserve power. This shows up as position drift, slower route recalculation, or the blue dot jumping between streets. The root cause is the GPS receiver pulling back on signal processing — not poor satellite coverage. Keeping the battery above 3.6V during active navigation maintains full receiver performance.

PNA 4000 shutting off without a low-battery warning

The on-screen battery indicator on the PNA 4000 reads from a fuel gauge that can fall out of calibration after the original cell degrades. A new cell resets the voltage curve, but the gauge needs one full discharge cycle to re-calibrate its cutoff threshold. Until that cycle completes, the device may cut power before the visual warning appears. Run the unit on navigation from a full charge down to auto-shutdown once — after that, the warning indicator tracks correctly against the actual cell voltage.