AB3300BWMC Philips Xenium W8555 Compatible Battery 3.8V 3300mAh

Philips Xenium W8555 / W8560 — 3.8V Li-Polymer Replacement Battery (AB3300BWMC)

This is a 3.8V, 3300mAh (12.54Wh) Li-Polymer cell replacing OEM part AB3300BWMC. It fits the Philips Xenium W8555 and W8560 smartphones. Physical dimensions are 75.98 × 61.88 × 5.56mm — confirm clearance before fitting if your unit has a third-party back cover.

• W8555 and W8560 shared platform: Both models run the same 3.8V battery rail, use the same connector pinout, and share the AB3300BWMC part number. One cell covers both devices — no BMS handshake differences between them.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a W8555 unit. The BMS accepted the cell without error flags, charge IC ramped to CV phase normally, and no thermal anomalies appeared at the battery contact points.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the phone's fuel gauge IC map the new cell's discharge curve before high-current charging pushes into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the Xenium W8555

The W8555's modem and display draw short, sharp current spikes. An aged or deeply discharged cell cannot hold its voltage rail steady under that load. When cell voltage drops below the BMS cutoff threshold — even briefly — the phone shuts off despite the OS showing charge remaining. This is a voltage cliff, not a capacity problem. A fresh cell with a healthy internal resistance value eliminates the drop, and the shutdowns stop.

Phone shows wrong battery percentage after cell swap

The Xenium W8555 uses a fuel gauge IC that builds its discharge model from historical cycle data stored against the old cell. After a replacement, that model is mismatched — the IC reads voltage and applies the wrong curve, so the percentage display jumps or reads high before dropping fast. One full discharge from 100% to auto-shutdown, followed by a complete charge without interruption, forces the IC to recalibrate against the new cell. After that cycle, percentage reporting stabilises. Do not top-up charge during this first cycle.