Navman PiN Pocket Replacement Battery 3.7V 1300mAh

Navman PiN Pocket / PiN 100 / PiN 300 — 3.7V Li-ion Replacement Battery

This 3.7V 1300mAh Li-ion cell replaces the original battery in the Navman PiN Pocket, PiN 100, and PiN 300 handheld GPS navigation devices. All three models share the same battery bay dimensions (50.00 × 35.90 × 8.50mm) and voltage rail, so one cell covers the full range. Capacity is 1300mAh (4.81Wh), matching the original specification.

• PiN Pocket, PiN 100, and PiN 300 fitment: These three Navman portables run the same 3.7V single-cell architecture with an identical connector and battery bay footprint. The BMS handshake requirements are the same across all three, so this cell initialises correctly in each variant without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the PiN platform and confirmed the BMS accepted the cell, reached full charge voltage at 4.2V, and held capacity through multiple cycles without triggering a protection cutoff.
• Sync before you swap: The PiN series stores active application state and route data in RAM powered directly by the main battery. Pull the battery without syncing first and any unsaved data — including recent route edits or favourites — is gone. Connect to your PC and complete a full data sync before removing the old cell.

Why the PiN Pocket won't boot after a new battery is installed

A freshly shipped Li-ion cell typically arrives at storage charge — around 3.6V to 3.8V — not full charge. The PiN boot sequence draws a brief current spike to initialise the GPS receiver and load the OS from flash. If the cell voltage is too low, the BMS drops the output rail before boot completes and the screen goes blank. The fix is straightforward: charge the new battery fully before attempting the first power-on. A solid charge light transitioning to full on the dock confirms the cell has reached 4.2V and the device will boot cleanly.

GPS lock takes longer than expected after battery replacement

The PiN series stores almanac and ephemeris data in battery-backed RAM to speed up subsequent GPS acquisition. When the battery is fully removed, that data is lost and the receiver must perform a cold start — downloading a full satellite almanac from scratch, which takes significantly longer than a warm fix. This is not a fault with the new battery. Once the device has acquired a full cold-start lock and the data is cached again, subsequent fix times return to normal. Leave the device in open sky after the first boot with the new battery to allow the almanac to rebuild.