Dopod P860 Replacement Battery POLA160 3.7V 1350mAh

Dopod P860 — 3.7V Li-ion Replacement Battery (POLA160)

This is a 3.7V, 1350mAh Li-ion replacement battery for the Dopod P860 Windows Mobile smartphone. It replaces OEM part numbers POLA160 and 35H00101-00M. The P860 is a compact PDA-phone hybrid, and this cell restores full power functionality to the device.

• P860 fit: The P860 uses a single-cell 3.7V Li-ion pack with a specific connector keying and BMS handshake tied to the device's power management IC. This cell matches that voltage rail and connector layout, so the phone's charge controller accepts it without triggering fault flags.
• Bench tested on actual hardware: We cycled this battery through full charge and discharge on compatible hardware. The BMS held voltage within spec across the discharge curve, and the charge controller completed a full CC/CV cycle without cutoff errors.
• Fuel gauge recalibration on first use: On first use after installation, disable any fast-charge mode and run one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its discharge curve against the new cell before high-current charging is applied to an uncalibrated cell.

Why the P860 reports wrong battery percentage after a cell swap

The P860 uses a fuel gauge IC that builds its percentage model from the previous cell's charge history. When you fit a new cell, the IC is still referencing the old degraded discharge curve. It will read high early in the discharge and then drop sharply. One full discharge down to automatic shutdown, followed by an uninterrupted charge to 100%, forces the IC to remap its curve against the new cell's actual capacity.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage collapses faster than the fuel gauge IC predicts under combined screen and modem load. The P860's processor and radio draw sharp current spikes — if the cell's internal resistance is slightly elevated, voltage drops below the cutoff threshold before the percentage reaches zero. The fix is to run the recalibration cycle first: a full drain to shutdown, then a full charge. If shutdowns persist after two full cycles, check that the battery connector is fully seated, as a partial connection adds resistance that accelerates the voltage sag — target a resting open-circuit voltage of 4.1–4.2V after a full charge to confirm the cell is within spec.