AudioVox PPC-6600 Compatible Battery 3.7V 4200mAh

AudioVox PPC-6600 Series — 3.7V Li-ion Replacement Battery (PH26B)

This is a 3.7V, 4200mAh Li-ion cell (15.54Wh) for the AudioVox PPC-6600, PPC-6601, and VX6600 Windows Mobile smartphones. It replaces the original PH26B pack when the existing cell can no longer hold a usable charge. Dimensions are 84.78 × 58.32 × 11.68mm — confirm your bay clearance before fitting.

• PPC-6600, PPC-6601, and VX6600 fitment: All three models share the same battery bay geometry and 3.7V single-cell architecture. The connector pinout and contact spacing are identical across the series, so one cell covers all three variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the PPC-6600 platform. The BMS accepted the charge IC handshake cleanly and did not trip on initial load. Voltage held above 3.5V under sustained screen and radio load.
• Fuel gauge recalibration on first cycle: After fitting, disable any fast-charge accessory and run one full discharge-charge cycle at standard current. The fuel gauge IC on these Windows Mobile devices calibrates its coulomb counter against the cell's actual discharge curve — skipping this step leads to erratic percentage readings in the status bar.

Why the PPC-6600 reports wrong battery percentage after a cell swap

The fuel gauge IC on this platform stores a learned discharge curve from the original cell. When you install a new cell, that stored curve no longer matches actual cell behaviour. The IC continues calculating state-of-charge against stale data, so the percentage shown in Windows Mobile is off — sometimes by 15–20 points. One complete discharge-charge cycle at standard current forces the coulomb counter to reset and rebuild its model against the new cell's actual capacity.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the radio module's minimum rail faster than the fuel gauge expects. The PPC-6600's GSM modem draws a short high-current spike during a call or data event — if the cell cannot sustain voltage under that load, the phone cuts out even though the percentage gauge still shows charge remaining. The fuel gauge IC reads voltage at rest, not under load, so the gap between reported and real capacity widens as the cell warms up. Run the device through two full calibration cycles; if shutdowns persist below 3.6V under load, the cell may have taken a deep-discharge event in storage.