Pentagram Logger P3106 3.7V Replacement Battery 1000mAh

Pentagram Logger P3106 — 3.7V Li-ion Replacement Battery

This is a 3.7V 1000mAh Li-ion cell for the Pentagram Logger P3106 handheld GPS navigator. It replaces the original battery when capacity has dropped or the cell no longer holds a charge. The Logger P3106 is a field GPS unit used for outdoor tracking and route recording.

• Logger P3106 fitment: The P3106 runs a single-cell 3.7V Li-ion configuration. This cell matches the voltage rail, physical footprint (52.96 × 33.64 × 5.15mm), and connector orientation the unit expects. No BMS renegotiation is required on power-up.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a GPS-class load profile. The protection circuit responded correctly to low-voltage cutoff, and the cell reached rated capacity within two full cycles.
• First fix after fitting: After any full power removal, the Logger P3106 loses its satellite almanac and performs a cold start. Take the unit outdoors immediately after fitting and power it on — allow 5 to 10 minutes for the first satellite fix. Subsequent warm starts will lock significantly faster.

GPS accuracy reduced at low battery on the Logger P3106

When cell voltage drops toward the lower end of the discharge curve, some GPS units reduce RF receiver sensitivity to stay within power budget. On the P3106, this can show as position drift or a reduced fix count before any low-battery warning appears on screen. The fix quality degrades before the device shuts off, so poor accuracy late in a session is often a battery signal, not a signal environment issue. Keeping the cell above 3.6V maintains full receiver operation.

Logger P3106 shuts off without warning mid-session

The on-screen battery indicator on the P3106 is calibrated against the original cell's discharge curve. A replacement cell with a slightly different curve can cause the indicator to misread state of charge, and the protection circuit's hard cutoff trips before the visual warning reaches one bar. This is not a fault with the cell — it is a gauge calibration lag. Run two full charge and discharge cycles to allow the device to re-learn the curve, and the warning sequence will align correctly with actual cutoff voltage near 3.0V.