Tansonic PNA 6000 Compatible Battery 3.7V 1250mAh

Tansonic PNA 6000 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1250mAh Li-ion battery for the Tansonic PNA 6000 portable GPS navigator. It fits directly into the PNA 6000 and restores power to a unit where the original cell no longer holds a usable charge. Dimensions are 50.00 × 36.60 × 6.60mm — confirm these against your existing cell before fitting.

• PNA 6000 fit: The PNA 6000 runs a single-cell 3.7V Li-ion pack at this exact form factor. No adapters or connector modifications are needed — the cell slots into the original battery bay using the same contact arrangement as the factory unit.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under GPS-active load conditions. The BMS held voltage within the expected 3.0V–4.2V window throughout and triggered protection cutoff correctly at the low-voltage threshold.
• First satellite fix after fitting: After any full power removal, the PNA 6000 performs a cold start. Power the unit on outdoors in an open area and allow 5–10 minutes for the first satellite fix. Subsequent warm starts complete in under a minute once almanac data is cached.

GPS accuracy reduced at low battery on the PNA 6000

When cell voltage drops below approximately 3.3V, some GPS units reduce receiver sensitivity to lower current draw. On the PNA 6000, this can show as position drift or slower track updates before the low-battery indicator even appears. The receiver is pulling less power to keep the unit alive longer, but signal processing suffers. Keeping the battery above 50% charge during active navigation avoids this threshold entirely.

PNA 6000 shutting off without warning at low battery

After fitting a new cell, the PNA 6000's charge indicator may not be calibrated to the new battery's discharge curve. The unit can show one or two bars remaining and then cut off abruptly — the shutdown threshold is hit before the visual warning catches up. This corrects itself after two or three full charge-discharge cycles. Run the unit down to auto-shutoff, then charge fully to 4.2V each time until the indicator tracks accurately.