Philips Xenium S395 Replacement Battery AB3000PWMT 3.8V 2800mAh

Philips Xenium S395 / CTS395 — 3.8V Li-Polymer Replacement Battery (AB3000PWMT)

This is a 3.8V, 2800mAh Li-Polymer cell built to the AB3000PWMT specification. It fits the Philips Xenium S395 and CTS395 smartphones. Physical dimensions are 85.82 × 62.00 × 4.30mm — confirm these against your original cell before installing.

• Xenium S395 and CTS395 compatibility: Both models share the same battery bay geometry, connector pinout, and BMS handshake protocol, so a single AB3000PWMT cell covers both. The 3.8V nominal rail matches the charge IC on both boards without any hardware modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the S395 platform. The BMS negotiated correctly with the phone's charge controller, and cell protection tripped at the expected cutoff voltages at both ends of the curve.
• First cycle after installation: Disable fast charging in the phone's settings for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins. Skip this step and the percentage readout will drift from the first session.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff problem, not a capacity problem. When the modem transmits or the screen runs at full brightness, current draw spikes sharply. If the cell's internal resistance is higher than the original — common on a fresh cell before it beds in — terminal voltage drops below the protection threshold under load even though the fuel gauge still shows charge remaining. The phone's power IC reads the voltage drop as a dead cell and cuts out. Run two or three full discharge-charge cycles and the internal resistance settles; the shutdowns typically stop. If they continue past cycle three, check that the connector is fully seated — a partial connection raises contact resistance and triggers the same symptom.

OS reporting wrong battery percentage after cell swap

The Xenium S395 uses a coulomb counter that was calibrated against the original cell's discharge curve. Swapping the cell does not reset that calibration automatically. Until the fuel gauge IC completes a full discharge-charge cycle with the new cell, it will read percentages against the old curve and report incorrect values — often showing full charge earlier than actual, or jumping erratically between readings. To recalibrate, charge to 100%, discharge fully until the phone shuts off on its own, then charge back to 100% without interruption. One complete cycle is usually enough to re-anchor the coulomb counter to the new cell.